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Data Security

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All data is stored in secure electronic systems accessible only to Oasys staff with both valid network login credentials and specific authorisation to access the system.  Our systems further limit data access by role to ensure data is available only to those who have a specific need to see it.

If at any point you suspect or receive a suspicious communication from someone suggesting they work for Oasys or a website claiming to be affiliated with Oasys, please forward the communication to us or report the incident by email to [email protected] or in writing to Oasys, 13 Fitzroy Street, London, UK, W1T 4BQ as soon as possible.

Data Security Notice Updated 27th February 2020

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Website Terms and Conditions

The contents of this web site are protected by copyright and other intellectual property rights under international conventions. No copying of any words, images, graphic representations or other information contained in this web site is permitted without the prior written permission of the webmaster for this site.

Oasys accepts no responsibility for the content of any external site that links to or from this site.

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Software Licensing Terms

Terms and Conditions of Purchase

The full conditions of purchase and maintenance for all Oasys software are set out in the Oasys Software Licence and Support Agreement. All prices are subject to TAX at the current rate.

Prices and specifications are subject to change without notice – please ask for a written quotation.

Although every care has been taken to ensure the accuracy of all information contained herein, the contents do not form or constitute a representation, warranty, or part of any contract.

Superseded Versions of Terms and Conditions

Oasys keeps copies of all superseded versions of its terms and conditions.

Maintenance & Support Services

Support and maintenance is included with all subscription licences for their full duration.

Annual maintenance contracts are available for software under a perpetual licence, prices are based on a percentage of the most recent list price.

This service includes:

  • telephone/email/web based support
  • free software updates available via internet download
  • personalised output header for many products

Structural Analysis and Design Software — GSA Suite

Structural engineers designing buildings, bridges and tensile structures need comprehensive software to get robust results. Tackle any structural engineering challenge with this complete structure design and analysis software package. GSA Suite gathers the benefits of all the GSA variants into one single offering.
*New in GSA 10 GSA Analysis GSA Building GSA Bridge GSA Suite
Application Programming Interface

Use the COM API with your own code or third-party programs to create, edit, and optimise your structure

Modelling Tools

Text, graphical and automatic creation of geometry and loads

Tapered Elements*

Define entities which vary in size along their lengths

Nonlinear Elements

Compression-only struts, tension-only ties, nonlinear springs, and cables

2D and 3D Elements

Covers all element types in GSA such as 1D, 2D, 3D, and spring elements

2D Members*

Compression-only struts, tension-only ties, non-linear springs, and cable

Nonlinear Materials

Elastic-Orthotropic and Elastic-Plastic Isotropic materials

Linear, P-Delta, and Nonlinear Analyses

Analyse for geometric and material nonlinearity over large deflections, including dynamic relaxation and explicit solvers

Imperfection Analysis*

Impose imperfections on analysis without modifying the base geometry

Staged Analysis

Add, remove, and change elements and constraints within analyses

Dynamic Analysis & Response

Modal, Ritz, and Explicit analyses, including P-Delta effects, with Response Spectrum, Harmonic, Time History, and Periodic analyses

Buckling Analysis

Modal buckling of 1D & 2D elements; Nonlinear buckling of 1D elements

Wave Loading

Generate wave and current loads on submerged structures

Raft Analysis

Combine structural models with nonlinear soil for foundation design

Footfall Analysis

Calculate accelerations, velocities and response factors from pedestrian loading

RC Design

Design of reinforced concrete slabs and walls to international standard

Fast Slab Reinforcement Calculations*

Generate reinforcement results as user modules

Steel Design

Design of steel beams, columns, and braces to international design codes

Bridge Loading

Lane and vehicle load optimisation for highway and railway bridges

Form-finding

Geometry generation for tension and compression only structures

Fabric Analysis

Analysis of fabric nonlinear materials

Comprehensive design and analysis software

The intuitive structure design software allows engineers to design structural models with 1D, 2D and 3D finite elements, however large or complex. With inbuilt form finding routines and API links to your own programs, GSA Suite allows you to create the optimum structure. It will then design your steelwork and concrete reinforcement, check for seismic response and human induced vibration, calculate buckling capacities, and can even tell you where you have made mistakes in your model.

As engineers and architects continue to push boundaries with new creations, GSA offers a quick, accurate, and affordable solution for even the most advanced project. GSA has supported a wide range of projects worldwide, including the Swiss Re (London), CCTV Headquarters (Beijing) and Las Vegas High Roller, and has global recognition as one of the most complete packages for structural engineers.

GSA’s easy-to-use interface and customer support mean you’ll be creating and sculpting models in no time. A spreadsheet-friendly file format and smooth interaction with other tools make this software the perfect choice. GSA is BIM (Building Information Modelling) compatible, and also designed to connect with a range of other leading software packages, including Autodesk Revit.

GSA Suite is our most comprehensive structural package, offering all of the GSA variant features, along with form finding and fabric analysis tools for tensile and gridshell structures.

Download Brochure

How GSA Suite Works

Input: Create structural finite element analysis models using CAD and BIM links, directly in the table or graphical views, or using your own scripts via the Application Programming Interface. Assign linear and nonlinear materials to a variety of element types, whether beams from catalogues, standard shapes, profiled slabs, or your own special requirements. Add static, dynamic, prestress, or thermal loads and analyse the effect.

Analysis and Design: GSA includes several solvers, including:

  • Form finding for lightweight structures
  • Tension-only fabric material models
  • Steel member and concrete slab design
  • Footfall analysis for human-induced vibration
  • Bridge load optimisation
  • Matrix-based stiffness method for static and p-delta analyses
  • Dynamic relaxation and explicit solvers for nonlinear static and dynamic problems
  • Eigenvector solvers for modal vibration and buckling analyses
  • Dynamic response analyses for seismic response spectrum or time history, harmonic and periodic vibrations, and human-induced vibrations
  • Soil structure interaction for rafts and piled structures
  • Diagnostic analyses for resolving modelling problems

Using a choice of form-finding methods, GSA will determine the optimum geometry for your arch, cable net, grid shell, or fabric structure.

GSA will find the lightest, shallowest, cheapest, or most environmentally friendly steel beam section to carry the load, and work out the ideal quantity of reinforcement in your concrete slabs and walls.

Output: Output forces, moments, deformed geometry, and other results in graphical views, tables, and graphs. Export analysis models from the structural analysis software to LS DYNA, model changes to Revit, or text and numbers to Office documents.

Key Features & Benefits

  1. Footfall-induced vibration analysis with tools developed by engineers at the forefront of this technique
  2. Member and steel design includes automatic restraints based on connections and steel section optimisation
  3. Structure analysis software for static, dynamic, and buckling analysis
  4. Geometrically optimise tension-only and compression-only structures

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Capabilities of GSA Suite

Redesigned and streamlined user interface – Quick access to popular tasks with customisable panes and toolbars.

New beam section – Improve interoperability by allowing you to define any section once and then being able to reuse it within any Oasys software program.

New Beam Section

Materials – Define design grade materials at the analysis and model building stage. Build user-defined materials.

Grid loading – Work with 1D or 2D elements, allowing patch, line, and bridge loads on meshes.

IFC import & export with GsRevit – Interchange data between a variety of BIM friendly platforms with GSA 9.0’s new IFC import and export. As well as new Revit integrations allowing you to map entities with ease.

IFC model imported into GSA

Explicit solver – A new analysis solver for dealing with short time-span, high frequency dynamic non-linear situations has been implemented along with improved load curves functionality.

Seismic analysis – New advanced seismic analysis features include response spectrum analysis with improved display, tools and combinations.

3D solid elements & soil structure interaction – Now includes 3D solid (brick) elements allowing a wide range of structural properties to be simulated. New Contact and Damper element types have been introduced to model dynamic problems such as modelling contact between different elements.

Brick Element: Diagram – Surface Contour – Filled Contour

Raft Analysis – The Raft Analysis feature is now available in all GSA variations. This analysis type is perfect for busy foundation designers. This easy-to-use feature combines non-linear structural and geotechnical models to calculate accurate settlements, soil pressures, bending moments and other structural stresses in a fraction of the time.

Design improvements – Design materials have improved functionality and create more consistent models.

Steel member design – Improved member design that provides analysis releases along with in-depth functionality options with instant results in report view.

Steel Design

Member libraries

 

New chart views, reporting and graphics – In addition to the instant report view results, chart view functionality is improved with easy updating and exporting of curves. Graphics have been improved making your 3D model and 2d graphic look even better.

New Chart Views

Improved Graphics

API improvements – New features include direct objects for Members that lead to faster access and productive code development, expansion of existing objects, and the ability to run automated design from the API using the new Design Task functionality.

Finding the correct geometry and prestress forces for tension only structures such as fabric structures, fabric roofs and cable nets is crucial: mistakes lead to wrinkles, flapping, and ponding problems. While some programs will generate geometry that looks nice, GSA will find the geometry that is right. GSA gives you the control to offset the effects of fabric to cable prestress, radial to circumferential stresses, and more.

GSA also enables you to generate the organic geometry for compression-only structures such as grid shells and slender arches.

GSA uses its powerful dynamic relaxation non-linear solver to form find using soap film, force density and structural properties to find the optimum structural arrangement, and then analyse and design it to all the serviceability and ultimate loads.

 

Form-finding  and fabric analysis – Further Detail

Dynamic relaxation method with the following options

  • Soap film for fabric and cable net structures
  • Force density for cable net structures
  • Applied force for pure compression or tension structures
  • Geodesic, Bar and Free spacer elements for geometry control during soap film form finding
  • Output of new geometry and prestress forces for subsequent analysis

Fabric analysis

  • Non-linear analysis of foils and fabrics
  • Zero thickness elements with optional tension only capacity
  • Combine fabric elements with structural cables and members

As designs become more efficient, the resulting structures get lighter and more responsive to human induced vibrations. This means that footfall induced vibration is becoming an important serviceability design requirement for office and residential buildings, foot bridges and staircases: it is an essential requirement for demanding situations such as hospitals, footbridges and laboratories.

GSA enables you to find the footfall response over the whole structure, with full contour plots and detailed graphs showing exactly where the satisfactory and problem areas are. You can thus explore cost-effective design solutions and advise you client on how their structure will respond to human induced vibration.

Product benefits

  • GSA is the only program available that allows you to analyse any structure for footfall analysis, whether an irregular floor, a bridge or a staircase, whether concrete, steel, or composite.
  • Quick and accurate predictions of resonant and transient response to footfall vibrations, including response factors, peak accelerations, and peak, RMS and RMQ velocities.
  • Define areas of interest on a floor; e.g. the effect of running down a corridor next to an operating theatre

Footfall analysis 

Sensitivity to vibration is becoming increasingly significant as advances in structural design result in lighter structures; the lighter the structure the more sensitive it is to induced vibration.

Footfall analysis methods

  • Arup / Concrete centre method – Concrete Centre CCIP-016
  • Steel Construction Institute – P354
  • American Institute of Steel Construction – Steel Design Guide 11
  • Staircase method – CCIP-016 & SCI P354

GSA is perfect for busy foundation designers as it enables you to analyse how your structure interacts with the ground for optimum design. This easy-to-use software combines non-linear structural and geotechnical models to calculate accurate settlements, soil pressures, bending moments and other structural stresses in a fraction of the time.

 

GSA adds Oasys Pdisp’s soil pressure displacement engine to GSA Suite’s finite element analysis. The structure then interacts with the ground via piles, rafts or pads so they both work together to carry the load, whatever the structure, whatever the soil. GSA also integrates with Pdisp, importing soil models and exports results for further geotechnical investigation.

Calculate the reinforcement requirements for concrete slabs and walls to international design codes:

  • Australia: AS 4100:1998
  • Eurocode: EN 1993-1-1:2005 Eurocode 3 (including French, Dutch, UK, Singapore, and UK fire annexes)
  • Hong Kong: HKSUOS:05 & 11
  • India: ISS 800:1984 & 2007
  • UK: BS 5950-1:2000
  • US: AISC LRFD3, AISC 05 ASD & LRFD, AISC 10 ASD & LRFD
  • South African: SANS 10162-1:2011
  • Generic: Stress check

Results are available in various forms, including numeric utilization ratios and calculations as rich text. The different forms of result available mean that the user can avoid information overload, but can still audit the calculations at a very basic level when appropriate. Utilization ratios can be plotted (contoured) on the model just like any other numeric result, so enabling rapid understanding of which parts of a structure are overstressed or are over designed. Calculation results are marked up in colour to draw attention to problems and important results within the calculations.

Overview

GSA combines GSA structural model with a 3D brick or Pdisp soil model to calculate the soil structure interaction.

  • Direct finite element analysis using brick elements and friction spring interaction elements
  • Iterative analysis using the GSA and Pdisp solvers (does not need the installation of Pdisp)
  • Specify soil properties and locations
  • Specify soil-structure geometry
  • Raft & Pile soil structure interaction

Find how your structure interacts with the ground for the optimum foundation design

Raft is perfect for busy foundation designers. This easy-to-use software combines non-linear structural and geotechnical models to calculate accurate settlements, soil pressures, bending moments and other structural stresses in a fraction of the time.

Features

  • Multiple soil profiles
  • Multiple soil zones
  • Linear or nonlinear soils
  • Pile soil interaction coefficients (p-y, t-z, q-z)
  • Additional soil loads
  • Pdisp import/export

Nonlinear analysis

Analyse structures with large deflections, plastic yielding of materials, snap-through, sway effects, and more. GSA uses the dynamic relaxation method to enable you to analyse structures that other programs will not touch.

 

Buckling

GSA enables you to calculate the buckling load factors on a range of structures, from complex frames to shell structures and lateral torsional buckling of plate girders. It also includes non-linear buckling effects so you can plot the deflections of columns and struts against load to accurately assess safety factors.

 

Dynamic analysis and response

GSA includes both modal analysis for calculation of the natural dynamic frequencies of your structure and Ritz analysis specially designed for seismic response calculations. You can choose to include axial load effects to change stiffnesses in both these methods.

Following on from the modal or Ritz analysis, GSA enables you to calculate the structural response using a number of dynamic post processors, including seismic response to multiple international codes, linear time history, harmonic loads for vibrating machinery, and more.

 

Other Analysis Types include:

  • Mass analysis
  • Form Finding
  • Analysis envelope
  • Model stability diagnostic analysis
  • Static analysis
    • Linear Static
    • Static P-delta (p-delta by own load case, different load case, or previous analysis case)
    • Non-linear static

 

Automated bridge loading to:

  • Australia: AS 5100 2, M1600, S1600, M1600-Triaxle, SM1600
  • Eurocode: EC1 UK, generic, user defined
  • Hong Kong: SDM
  • UK: – CS 454, BD37, BD21 HB, BD86 SV TT / Train / 150 / 100 / 80, UIC71, RU, RL, SW/0, SW/2, HA, HB, SV
  • US: AASHTO 17, LRFD 3, H20-44, HS20-44. HL-93

Path and vehicle loading to

  • Australian Highway Loading: M1600, S1600, M1600-Triaxial, SM1600
  • Eurocode Loading: Generic, UK, user defined
  • UIC and UK Railway Loading: UIC71, RU, RL, SW/0, SW/2
  • UK and HK Highway Design Loading: HA, HB, CS 454(ALL 2)
  • US Assessment Loading: SV
  • US Highway Loading: H20-44, HS-20-44, HL-93

The API enables GSA to be driven from a spreadsheet macro or other external program. In addition, the command line interface enables GSA to be driven from batch files.

GSA includes a bi-directional link between GSA & Revit 2014, 2015, 2018 and 2019, Revit Structure 2013 & Revit Structure 2012. With this Revit users can transfer model information between Revit and GSA with minimal loss of data.

Data from tables can be transferred to and from spreadsheets using the standard cut and paste facilities. The GWA file (ASCII data file) is written as a tab-separated file to facilitate input into spreadsheet programs

 

Import options

  • AutoCAD DWG / DXF
  • CIMsteel CIS/1
  • Revit Structure (see below)
  • Pdisp

Export options

  • ADC
  • ASAS
  • AutoCAD DWG / DXF
  • CIMsteel CIS/1
  • LS-DYNA
  • NASTRAN
  • OpenSees
  • Revit Structure (see below)
  • SAP2000
  • Steel Member CSV
  • Pdisp

For regular structures, a Data Generation wizard will allow the user to specify the structure in terms of few key parameters and automatically generate the model data. For more complex structures structural geometry and loading data may be input through either the graphical data generator (“Sculpt”) or a more traditional spreadsheet format, which enables all structural geometry to be rapidly generated and edited.

When the structure is complete, all loading may be similarly generated and displayed diagrammatically.

Reinforced Concrete Slab Design

Design of reinforced concrete slabs and walls to:

  • Australia: AS 3600: 2009
  • Canadia: CSA A23.3-04 (2007)
  • Eurocode: EN 1992-1-1:2004 Eurocode 2 (including German, UK, Dutch, French, Italian, Danish, and Singapore annexes)
  • Hong Kong: HK Structures Design Manual 2002, Code of Practice 2013
  • India: IRS Concrete Bridge Code 1997, IS 456:2000
  • UK: BS 5400, BS 8110-1:1997 (Rev 2005)
  • US: ACI 318-11, ACIM 318-11

Output options

  • Output of areas of steel on easy to rationalise contour plots
  • Output of moment: ultimate moment ratios
  • Tabular output of areas of steel required

Steel Member Design

Design of steel members to:

  • Australia: AS 4100:1998
  • Canadian: CSA S16-09
  • Eurocode: EN 1993-1-1:2005 Eurocode 3 (including French, Dutch,  UK, Singapore, and UK fire annexes)
  • Hong Kong: HKSUOS:05 & 11
  • India: ISS 800:1984 & 2007
  • UK: BS 5950-1:2000
  • US: AISC LRFD3, AISC 05 ASD & LRFD, AISC 10 ASD & LRFD
  • South African: SANS 10162-1:2011
  • Generic: Stress check

Output options

  • Contouring of utilization ratios
  • Tabular output of utilization ratios and verbose and brief calculations
  • Colour highlighting of errors and warnings in calculations
  • Automatic calculation of effective buckling lengths based on specified member restraints

Steel member design features include:

  • Support for curved and explicit members
  • Results are available in various forms, including numeric utilization ratios and calculations as rich text.
  • The different forms of result available mean that the user can avoid information overload, but can still audit the calculations at a very basic level when appropriate.
  • Utilization ratios can be plotted (contoured) on the model just like any other numeric result, so enabling rapid understanding of which parts of a structure are overstressed or are over designed.
  • Calculation results are marked up in colour to draw attention to problems and important results within the calculations. They are available in both brief and verbose formats.
  • Restraints can be specified in detail so that the program can evaluate the effective buckling lengths of complex multi-span beams. Alternatively, the user can specify the effective lengths (as is common in other steelwork design packages). Assistance is available to set up restraints, which are necessarily more complex than restraints used in analysis models.

 

The graphics facility in GSA is designed to feel spontaneous in response to the commands of the user. Various single key commands have the effect of producing standard views, adjusting the orientation, scale and content of the drawn structure, windowing, zooming, labelling and annotating the display. Dynamic viewing and animation of results provide powerful tools to aid you in understanding the behaviour of the structure. Graphical output can be sent to a printer or in DXF format for exporting directly to CAD systems.

 

Hong Kong engineers get go ahead to use GSA 10

Oasys GSA 10 has been pre-approved for use in calculations for steel member design used to support applications for submissions to the Hong Kong government authorities.

As with all such pre-approvals, it still leaves the onus on engineers to check that the program is applicable, that its assumptions are valid for each project and that it is correctly configured. So the pre-approval of software developed by the trusted Oasys team will be welcome to engineers working throughout the Territory.

See the list of pre-accepted computer programs for full details.

Following several requests from customers we have developed a small utility to allow those customers who have multiple variants of GSA shared licences to easily swap between them.

  1. This document refers to the utility installed with GSA version 9.0. For any earlier version, please contact us for details.
  2. Activate one of your GSA keys as follows
  • Open GSA
  • From the ‘Help’ menu choose ‘About GSA’
  • Click on ‘Manage License’
  • Click ‘Activate’
  • Enter the License Key & Password for the first variant of GSA that you have
  • You do not need to repeat these steps for the other variants of GSA that you have as GSA will find these in the License Database
  • Close the program
  1. When you next open the program, the variant that opens will be the one that you activated the key for last.
  2. To change the variant you wish to open, close GSA and run Oasys Key Switcher
    (Closing GSA is important to stop activations becoming locked on your machine). The Switch Keys utility won’t open if you are already running GSA 9.0.
  • For Windows 7 you can run Oasys Key Switcher from ‘Start > All Programs > Oasys GSA > Oasys Key Switcher
  • For Windows 8 and 10 you can find Oasys Key Switcher on your ‘Apps’ screen

5. Select the variant you wish to run and then open GSA. Each time you open GSA after this, it will run the last activated variant until you run Oasys Key Switcher again and select another variant.

Explore GSA Suite Solutions

Other GSA Applications

GSA Building

GSA Building is part of the Oasys General Structural Engineering suite and combines steel and concrete design, footfall, and soil-structure interaction analysis in the same building design software package. With this intuitive software, you can design structural models with skeletal frames and two-dimensional finite elements, enabling you to design and analyse even the most complex buildings.

Find out more »

GSA Analysis

GSA Analysis is used around the globe on all manner of projects. It provides engineers with a highly intuitive nonlinear analysis software tool to help realise the potential of design, no matter the challenges.

Find out more »

GSA Bridge

The perfect tool for busy bridge designers, GSA Bridge automates the optimisation of bridge loads (such as vehicle and lane loading) to a variety of international codes and checks for pedestrian footfall vibration. With a wide range of structural analysis types and 3D and 2D graphics for post-processing, bridge design analysis has never been easier.

Find out more »

Marina Bay Sands, Singapore

Arup Structural Engineer Juan Maier took advantage of the COM Interface offered in GSA when working on the multi-billion dollar Marina Bay Sands Integrated Resort in Singapore.

View Case Study »

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Further Information

The trials are limited for 14 days only, and there is no functional limitation. During the evaluation period you will only be able to use the software for test purposes and not for commercial paid work, and for the duration we will support you to get the most out of your test. GSA system requirements can be found in the FAQs.

All we ask from you are some details so we can contact you to issue you with the installation file.

Once you submit your details, a customer service agent will contact you and provide the free trial installer.

Existing customers who are fully maintained can download the latest versions of their software on demand from their personalised customer licensing portal.

Your login ID and Password for the portal is not the same as your website account. You can find your login details in your purchase confirmation email. Alternatively you can request for your login details to be sent to you by emailing [email protected].

This trial program includes all modules except Fabric. To activate these options, select them on the Advanced Features on the Preferences dialog. If you wish to trial form-finding and fabric analysis, please contact us at [email protected] for a licence.

During the evaluation period you will only be able to use the software for test purposes and not for commercial paid work, and for the duration we will support you to get the most out of your trial.

All we ask from you is some details so we can decide whether you are eligible for a trial.

Compatible with most modern day Windows operating systems.

The full conditions of purchase and maintenance are set out in the Oasys Software Licence and Support Agreement. All prices are subject to TAX at the current rate.

Prices and specifications are subject to change without notice – please ask for a written quotation.

Although every care has been taken to ensure the accuracy of all information contained herein, the contents do not form or constitute a representation, warranty, or part of any contract.

By completing and submitting this form you consent to Oasys Limited storing and processing the personal data you have provided. We will use this information to keep you updated about the products requested for customer service and sales analysis. We do not pass your details to third parties to use. For more information visit our privacy policy. You may opt-out at any time by emailing [email protected].

GSA – Suite

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Structural engineers designing buildings, bridges and tensile structures need comprehensive software to get robust results. Tackle any structural engineering challenge with this complete structure design and analysis software package. GSA Suite gathers the benefits of all the GSA variants into one single offering.

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"For many of HOK’s most technically challenging projects, our structural engineering team uses GSA as a preferred structural design and analysis tool. We appreciate its power and flexibility in working with parametric modeling software. GSA plays a key role in many of the tools HOK has built for early-stage interdisciplinary design optimization."
Matt Breidenthal - HOK

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