GMS:MODFLOW 6: Difference between revisions

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Starting in GMS 10.5, GMS can create a basic MDOFLOW 6 project. Building a MODFLOW 6 project in GMS makes use of a simulation workflow. The new simulation workflow builds the MODFLOW 6 using a different procedure than previously used in GMS. This process allows for multiple MODFLOW 6 simulations to be contained in the same project file.  
{{MODFLOW 6 Beta}}
{{MODFLOW 6 Links}}
Starting in GMS 10.5, GMS can create a basic MODFLOW 6 project. Building a MODFLOW 6 project in GMS makes use of a simulation workflow. The new simulation workflow builds the MODFLOW 6 using a different procedure than previously used in GMS. This process allows for multiple MODFLOW 6 simulations to be contained in the same project file.  


==Building a MODFLOW 6 Simulation ==
==Creating a New MODFLOW 6 Simulation ==
[[File:MODFLOW6 Sim.png|thumb|250 px|Example of a MODFLOW 6 simulation in the Project Explorer]]
[[File:MODFLOW6 Sim.png|thumb|250 px|Example of a MODFLOW 6 simulation in the Project Explorer]]
Before building a MODFLOW 6 simulation, a 3D UGrid of the project area is required. While the project can contain multiple UGrids, only one UGrid can be attached to each MODFLOW 6 simulation.
A 3D UGrid of the project area is required. While the project can contain multiple UGrids, only one UGrid can be attached to each MODFLOW 6 simulation. The desired UGrid will need to be linked to the MODFLOW 6 simulation.


To create a MODFLOW simulation:
To create a MODFLOW simulation:
# Right-click on an empty space in the Project Explorer, or right-click on "Project" in the Project Explorer, and select ''New Simulation'' | '''MODFLOW 6'''.
# Right-click on an empty space in the Project Explorer, or right-click on "[[File:Project Icon.svg|16 px]] Project" in the Project Explorer, and select ''New Simulation'' | '''MODFLOW 6'''.
# In the ''New MODFLOW 6 Simulation'' dialog, select the UGrid for the simulation to use and select any optional packages needed for the simulation.
# In the ''New MODFLOW 6 Simulation'' dialog, select the UGrid for the simulation to use and select any optional packages needed for the simulation.


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===MODFLOW 6 Simulation Right-Click Menus===
===MODFLOW 6 Simulation Right-Click Menus===
In the Project Explorer, right-clicking on MODFLOW 6 simulation brings up a menu with several commands. Some of these commands are common to other Project Explorer right-click menus. Others are unique to the simulation right-click menus. Some of these unique commands are:
In the Project Explorer, right-clicking on a MODFLOW 6 simulation brings up a menu with several commands. Some of these commands are common to other Project Explorer right-click menus. Others are unique to the simulation right-click menus. Some of these unique commands are:
*"[[File:Mf6sim data.svg|16 px]] Simulation Data"
*"[[File:Mf6sim data.svg|16 px]] Simulation Data"
**'''Simulation Run Queue''' – Opens the ''Simulation Run Queue'' dialog which shows all current simulation runs.  
**'''Simulation Run Queue''' – Opens the ''Simulation Run Queue'' dialog which shows all current simulation runs.  
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**'''Simulation Run Queue''' – Opens the ''Simulation Run Queue'' dialog which shows all current simulation runs.  
**'''Simulation Run Queue''' – Opens the ''Simulation Run Queue'' dialog which shows all current simulation runs.  
**''New Package'' – Opens a sub-menu listing all available packages that can be added to the simulation. Selecting a package will add it to the simulation. Some packages cannot be added until certain packages have already been added to the simulation and therefore will not be available until the prerequisite package has been added.
**''New Package'' – Opens a sub-menu listing all available packages that can be added to the simulation. Selecting a package will add it to the simulation. Some packages cannot be added until certain packages have already been added to the simulation and therefore will not be available until the prerequisite package has been added.
**'''Model Check''' – Checks the simulation for model errors and brings up the ''Model Check'' dialog if any errors are found.
**'''Check Simulation''' – Checks the simulation for model errors and brings up the ''Model Check'' dialog if any errors are found.
**'''Save Simulation''' – Saves the simulation and exports all files needed for the model run.
**'''Save Simulation''' – Saves the simulation and exports all files needed for the model run.
**'''Run Simulation''' – Starts the simulation model run and opens the ''Simulation Run Queue'' dialog.
**'''Run Simulation''' – Starts the simulation model run and opens the ''Simulation Run Queue'' dialog.
**'''Save Simulation and Run''' – Saves the simulation and exports all files needed for the model run. It then will launch the ''Simulation Run Queu'' dialog and begin the model runs for the simulation.
**'''Save Project, Simulation and Run''' – Saves the simulation and exports all files needed for the model run. It then will launch the ''Simulation Run Queu'' dialog and begin the model runs for the simulation.
**Read Solution
**'''Read Solution''' – Loads the solution file for the associated simulation. Requires that the simulation has had a successful run.


===New MODFLOW 6 Simulation Dialog===
===New MODFLOW 6 Simulation Dialog===
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* ''Simulation name'' – A name for the simulation can be entered in this field.
* ''Simulation name'' – A name for the simulation can be entered in this field.
* ''Select UGrid'' – This section will contain a list of available UGrids to use in the MODFLOW 6 simulation. A UGrid must be selected before the simulation can be created.
* ''Select UGrid'' – This section will contain a list of available UGrids to use in the MODFLOW 6 simulation. A UGrid must be selected before the simulation can be created.
*''Optional packages'' – This seciton contains a list of avaialble optional packages that be included when the simulation is created. A message at the bottom of this section will state which packages are already included in the simulation being created.
*Optional packages – This section contains a list of available optional packages that be included when the simulation is created. Packages are listed for both flow and transport model types. The model type must be selected to select the packages associates with the model type. The packages are organized by the model type.
:A message at the bottom of this section will state which packages are already included in the simulation being created.


[[File:NewMODFLOW6Sim.png|thumb|none|400 px|Example of the ''New MODFLOW 6 Simulation'' dialog]]
[[File:NewMODFLOW6Sim_v2.png|thumb|none|600 px| Example of the ''New MODFLOW 6 Simulation'' dialog]]
<!--
This dialog appears when a new MODFLOW 6 simulation is first created. The dialog has the following options:
* ''Simulation name'' &ndash; A name for the simulation can be entered in this field.
* ''Select UGrid'' &ndash; This section will contain a list of available UGrids to use in the MODFLOW 6 simulation. A UGrid must be selected before the simulation can be created.
*''Optional packages'' &ndash; This section contains a list of available optional packages that be included when the simulation is created. A message at the bottom of this section will state which packages are already included in the simulation being created.
 
[[File:NewMODFLOW6Sim.png|thumb|none|400 px|Example of the ''New MODFLOW 6 Simulation'' dialog]]-->


===Simulation Run Queue===
===Simulation Run Queue===
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**''TDIS filename'' &ndash; Indication of the confirmation or change in the tdis file name.
**''TDIS filename'' &ndash; Indication of the confirmation or change in the tdis file name.
*''MODELS'' &ndash; Model Block to be read by MODFLOW 6.
*''MODELS'' &ndash; Model Block to be read by MODFLOW 6.
**mtype &ndash;  The type of model added to a simulation.
**''mtype'' &ndash;  The type of model added to a simulation.
**mfname &ndash; The file name of the model name file.
**''mfname'' &ndash; The file name of the model name file.
**mname &ndash; The name the user has assigned the model.
**''mname'' &ndash; The name the user has assigned the model.
**(mname is the model’s Project Explorer name and cannot be changed here) &ndash; If the model name needs to be changed, it should be changed in the project explorer by the user.
**(mname is the model’s Project Explorer name and cannot be changed here) &ndash; If the model name needs to be changed, it should be changed in the project explorer by the user.
*''EXCHANGES'' &ndash; Exchange block to be read  by MODFLOW 6.
*''EXCHANGES'' &ndash; Exchange block to be read  by MODFLOW 6.
**exgtype &ndash; The exchange type.
**''exgtype'' &ndash; The exchange type.
**exgfile &ndash; The input file for the exchange.
**''exgfile'' &ndash; The input file for the exchange.
**exgmnamea &ndash; The name of the first model that is part of the exchange.
**''exgmnamea'' &ndash; The name of the first model that is part of the exchange.
**exgmnameb &ndash; The name of the second model that is part of the exchange.
**''exgmnameb'' &ndash; The name of the second model that is part of the exchange.
*''SOLUTIONGROUPS'' &ndash; Stored solution data to be read by MODFLOW 6.
*''SOLUTIONGROUPS'' &ndash; Stored solution data to be read by MODFLOW 6.
**mxiter &ndash; The area set aside to enter the maximum number of outer iterations for this solution group.
**''MXITER'' &ndash; The area set aside to enter the maximum number of outer iterations for this solution group.
**slntype &ndash; The solution type.
**''slntype'' &ndash; The solution type.
**slnfname &ndash; The name of the file containing solution input.
**''slnfname'' &ndash; The name of the file containing solution input.
**slnmnames &ndash; The array of model names to add to this solution.
**''slnmnames'' &ndash; The array of model names to add to this solution.


[[File:Mf6 simulationoptions.png|thumb|none|450 px|Example of the ''Simulation Options'' dialog for MODFLOW 6]]
[[File:Mf6 simulationoptions.png|thumb|none|450 px|Example of the ''Simulation Options'' dialog for MODFLOW 6]]
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The process for doing this is similar to that of saving native text files. In the [[GMS:Global Options/Basic Package|''MODFLOW Global/Basic Package'']] dialog, there is an option to ''Save MODFLOW 6 copy''. When this option is selected, MODFLOW 6 files will be generated when running MODFLOW from GMS.
The process for doing this is similar to that of saving native text files. In the [[GMS:Global Options/Basic Package|''MODFLOW Global/Basic Package'']] dialog, there is an option to ''Save MODFLOW 6 copy''. When this option is selected, MODFLOW 6 files will be generated when running MODFLOW from GMS.
==MF6 Flow Budget==
[[File:MF6 FlowBudget.png|thumb|350 px|The MODFLOW 6 ''Flow Budget'' dialog]]
The ''Flow Budget'' dialog for MODFLOW 6 can be accessed by right-clicking on the MODFLOW 6 simulation and selecting the '''Flow Budget''' command. The dialog contains the flow budget results from the MODFLOW 6 simulation run. The dialog cannot be accessed if the solution from the simulation has not be imported into the project.
The dialog will display the flow in and flow out for the sources/sinks, selected zones, and summary of the solution data. The dialog contains the following option:
*''Precision'' &ndash; Sets the precision of the decimal values in the dialog.


==Unsupported Features==
==Unsupported Features==
In GMS, some features of MODFLOW 6 are not yet supported or only have minimal support. These include:
*'''''MODFLOW 6 features'''''
**Only support for one SOLUTIONGROUP in the mfsim.nam file
** ‘NONE’ for cellid in SFR PACKAGEDATA block is not supported
**IPRN variable for arrays
**Advanced package output files
**Only the '#' character is supported for comments and not '!' or '//'
*'''''GMS interface functionality'''''
**Conceptual model approach for some packages
**Observations coverage
**Cell properties for array-based RCH and EVT packages
The MODFLOW 6 export option does not function with projects that are incompatible with MODFLOW 6. Projects with unsupported features or parameters will not be successfully exported.
<!--==Supported Packages==-->
Not all MODFLOW packages are supported in MODFLOW 6. The following table shows the correlation between MODFLOW 6 packages and packages from previous versions of MODFLOW.
{|class="wikitable"
|-
!MODFLOW 6 supported packages !! Equivalent Mf2k5/USG package
|-
|CHD, DRN, GHB, RIV, WEL ||CHD, DRN, GHB, RIV, WEL
|-
|DIS, DISV, DISU, TDIS ||DIS, DISU
|-
|EVT, RCH||EVT, ETS, RCH
|-
|GNC||GNC
|-
|IC||BAS
|-
|LAK||LAK
|-
|MAW||MNW2
|-
|NPF, STO||BCF, HUF, LPF, UPW
|-
|SFR||SFR
|-
|UZF|| UZF
|-
|MVR, GWF, OBS|| Not supported
|-
|Not Supported|| DRT, GAGE, MNW1, MNWI, STR, SUB, SWI, OBS, HOB, CHOB, RVOB, STOB, DROB
|}
<!--
In GMS, some features of MODFLOW 6 are not yet supported or only have minimal support. These include:
In GMS, some features of MODFLOW 6 are not yet supported or only have minimal support. These include:
*'''''MODFLOW 6 features'''''
*'''''MODFLOW 6 features'''''
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*'''''GMS interface functionality'''''
*'''''GMS interface functionality'''''
**Model Checker
**Model Checker
**Conceptual model approach and Map to MODFLOW
**Conceptual model approach and Map to MODFLOW for some packages
**Observations coverage
**Observations coverage
**Cell properties for array-based RCH and EVT packages
**Cell properties for array-based RCH and EVT packages
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|-
|-
|Not Supported|| DRT, GAGE, MNW1, MNWI, STR, SUB, SWI, OBS, HOB, CHOB, RVOB, STOB, DROB
|Not Supported|| DRT, GAGE, MNW1, MNWI, STR, SUB, SWI, OBS, HOB, CHOB, RVOB, STOB, DROB
|}
|}-->


==MODFLOW 6 Files==
==MODFLOW 6 Files==
The files generated for MODFLOW 6 will appear similar to those created for other versions of MODFLOW. The *.mfn.log file will contain notes about the export and mention any items that could not be exported for MODFLOW 6.
The files generated for MODFLOW 6 will appear similar to those created for other versions of MODFLOW. The *.mfn.log file will contain notes about the export and mention any items that could not be exported for MODFLOW 6.


For more details, see the [https://water.usgs.gov/ogw/modflow/mf6io_6.0.3.pdf MODFLOW 6 Input and Output document]
For more details, see the [https://water.usgs.gov/water-resources/software/MODFLOW-6/mf6io_6.3.0.pdf MODFLOW 6 Input and Output document]


==External Link==
==External Link==
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{{Navbox GMS}}
{{Navbox GMS}}
[[Category:MODFLOW]]
[[Category:MODFLOW]]
[[Category:MODFLOW 6]]
[[Category:External Links]]
[[Category:External Links]]

Latest revision as of 15:47, 1 July 2024

Gnome globe current event.png
 MODFLOW 6 is currently in Beta release for GMS
Some features and capabilities of MODFLOW 6 are still in development for GMS.
GMS Icon.png
MODFLOW 6
Models & Tools
GWF Model
GWT Model
Cell Properties Dialog
Zone File
Packages
Flow: GNC, HFB, NPF
GWF: BUY, CHD, CSUB,
DRN, EVT, GHB,
LAK, MAW, MVR,
OBS, RCH,RIV,
SFR, STO, UZF,
WEL
GWT: ADV, CNC, DSP
FMI, IC, IST, LKT,
MDT, MST, MVT,
MWT, OBS, SFT,
SRC,SSM, UZT
Other DIS, DISU, DISV,
IMS, OC, TDIS,
PEST
v • e

Starting in GMS 10.5, GMS can create a basic MODFLOW 6 project. Building a MODFLOW 6 project in GMS makes use of a simulation workflow. The new simulation workflow builds the MODFLOW 6 using a different procedure than previously used in GMS. This process allows for multiple MODFLOW 6 simulations to be contained in the same project file.

Creating a New MODFLOW 6 Simulation

Example of a MODFLOW 6 simulation in the Project Explorer

A 3D UGrid of the project area is required. While the project can contain multiple UGrids, only one UGrid can be attached to each MODFLOW 6 simulation. The desired UGrid will need to be linked to the MODFLOW 6 simulation.

To create a MODFLOW simulation:

  1. Right-click on an empty space in the Project Explorer, or right-click on "Project Icon.svg Project" in the Project Explorer, and select New Simulation | MODFLOW 6.
  2. In the New MODFLOW 6 Simulation dialog, select the UGrid for the simulation to use and select any optional packages needed for the simulation.

When the simulation has been initially created, the selected UGrid will be linked to the simulation and the simulation packages will appear in the Project Explorer. Certain packages will always be included in the simulation. These include the TDIS and IMS packages along with the GWF model which includes the DIS, NPF, IC, and OC packages. Optional packages, if any were selected, will appear under the GWF model.

Double-clicking on any of the packages listed in the Project Explorer will bring up the package dialog for that package.

MODFLOW 6 Simulation Right-Click Menus

In the Project Explorer, right-clicking on a MODFLOW 6 simulation brings up a menu with several commands. Some of these commands are common to other Project Explorer right-click menus. Others are unique to the simulation right-click menus. Some of these unique commands are:

  • "Mf6sim data.svg Simulation Data"
    • Simulation Run Queue – Opens the Simulation Run Queue dialog which shows all current simulation runs.
  • "MF6 Simulation Folder.svg MODFLOW 6 Simulations"
    • New Simulation – Creates a new MODFLOW 6 simulation in the Project Explorer. This simulation will not contain any of the packages in any existing simulations and therefor the packages must be added. Also, creating a new simulation using this method requires linking a UGrid to the simulation.
    • Simulation Run Queue – Opens the Simulation Run Queue dialog which shows all current simulation runs.
    • Save All and Run – Saves all MODFLOW 6 simulations in the project and exports all files needed for the model run. It then will launch the Simulation Run Queu dialog and begin the model runs for all simulations in the project.
  • MODFLOW Folder.svg Model
    • Simulation Run Queue – Opens the Simulation Run Queue dialog which shows all current simulation runs.
    • New Package – Opens a sub-menu listing all available packages that can be added to the simulation. Selecting a package will add it to the simulation. Some packages cannot be added until certain packages have already been added to the simulation and therefore will not be available until the prerequisite package has been added.
    • Check Simulation – Checks the simulation for model errors and brings up the Model Check dialog if any errors are found.
    • Save Simulation – Saves the simulation and exports all files needed for the model run.
    • Run Simulation – Starts the simulation model run and opens the Simulation Run Queue dialog.
    • Save Project, Simulation and Run – Saves the simulation and exports all files needed for the model run. It then will launch the Simulation Run Queu dialog and begin the model runs for the simulation.
    • Read Solution – Loads the solution file for the associated simulation. Requires that the simulation has had a successful run.

New MODFLOW 6 Simulation Dialog

This dialog appears when a new MODFLOW 6 simulation is first created. The dialog has the following options:

  • Simulation name – A name for the simulation can be entered in this field.
  • Select UGrid – This section will contain a list of available UGrids to use in the MODFLOW 6 simulation. A UGrid must be selected before the simulation can be created.
  • Optional packages – This section contains a list of available optional packages that be included when the simulation is created. Packages are listed for both flow and transport model types. The model type must be selected to select the packages associates with the model type. The packages are organized by the model type.
A message at the bottom of this section will state which packages are already included in the simulation being created.
Example of the New MODFLOW 6 Simulation dialog

Simulation Run Queue

Example of the Simulation Run Queue

The Simulation Run Queue is used to manage multiple simulations. Once a simulation is started, the Simulation Run Queue appears. The dialog can also be reached by right-clicking on a simulation item in the Project Explorer and selecting the Simulation Run Queue command.

The number of processes allowed in the run queue is determined by the following option:

  • Maximum Number of Concurrent Processes Allowed – Determines how many processes can be active in GMS at the same time. A simulation may contain multiple processes.

The run queue will show all simulations that are either currently running or have not yet been removed from the run queue. Each simulation will be listed in the order the simulation runs were started. Each simulation can be expanded to show what happened during the model run. If the model has a pre-processor and/or a post-processor, these will be displayed separately from the main model run. Process bars display how much of the process have been completed.

The following actions can be taken for each simulation:

  • Load – Loads the solution files into SMS from a completed simulation run.
  • Abort – Ends a simulation run before it has completed.
  • Remove – Deletes a completed or aborted simulation from the run queue.

Towards the bottom of the dialog, the following is displayed:

  • Command Line – Shows the results of the command line model run for the selected simulation.

Simulation Options Dialog

The Simulation Options dialog allows setting options that govern part of the simulation run. The dialog is reached by double-clicking on the model in the Project Explorer, or right-clicking on the model and selecting Open. The dialog has the following sections:

  • Sections list – A list of sections that can be turned on or off:
    • COMMENTS – Turn on to make the COMMENTS section visible.
    • OPTIONS – Turn on to make the OPTIONS section visible.
    • TDIS – Turn on to make the TDIS section visible.
    • MODELS – Turn on to make the MODELS section visible.
    • EXCHANGES – Turn on to make the EXCHANGES section visible.
    • SOLUTIONSGROUPS – Turn on to make the SOLUTIONGROUPS section visible.
  • COMMENTS section – Enter general alphanumeric comments. Comments entered here get written at the top of the file, preceded by a '#' symbol.
  • OPTIONS – A list of options regarding actions taken concerning stored data in MODFLOW 6.
    • Continue even if one or more solutions do not converge (CONTINUE) – Indicates that the simulation should continue even in the described situation.
    • Model input check routines should not be called prior to each time step (NOCHECK) – Indicates that the model input check routines should not be called prior to each time step.
    • Print detailed memory manager usage (MEMORY_PRINT_OPTIONS) – Controls whether the detailed memory manager usage will be printed at the end of the simulation list file.
  • TDIS – Temporal Discretization Input file.
    • TDIS filename – Indication of the confirmation or change in the tdis file name.
  • MODELS – Model Block to be read by MODFLOW 6.
    • mtype – The type of model added to a simulation.
    • mfname – The file name of the model name file.
    • mname – The name the user has assigned the model.
    • (mname is the model’s Project Explorer name and cannot be changed here) – If the model name needs to be changed, it should be changed in the project explorer by the user.
  • EXCHANGES – Exchange block to be read by MODFLOW 6.
    • exgtype – The exchange type.
    • exgfile – The input file for the exchange.
    • exgmnamea – The name of the first model that is part of the exchange.
    • exgmnameb – The name of the second model that is part of the exchange.
  • SOLUTIONGROUPS – Stored solution data to be read by MODFLOW 6.
    • MXITER – The area set aside to enter the maximum number of outer iterations for this solution group.
    • slntype – The solution type.
    • slnfname – The name of the file containing solution input.
    • slnmnames – The array of model names to add to this solution.
Example of the Simulation Options dialog for MODFLOW 6

Exporting MODFLOW 6 Files

Starting in GMS 10.4, GMS can export MODFLOW files for use with MODFLOW 6. This version of MODFLOW contains a new object-oriented program and underlying framework for supporting multiple types of models within the same simulation.

The process for doing this is similar to that of saving native text files. In the MODFLOW Global/Basic Package dialog, there is an option to Save MODFLOW 6 copy. When this option is selected, MODFLOW 6 files will be generated when running MODFLOW from GMS.

MF6 Flow Budget

The MODFLOW 6 Flow Budget dialog

The Flow Budget dialog for MODFLOW 6 can be accessed by right-clicking on the MODFLOW 6 simulation and selecting the Flow Budget command. The dialog contains the flow budget results from the MODFLOW 6 simulation run. The dialog cannot be accessed if the solution from the simulation has not be imported into the project.

The dialog will display the flow in and flow out for the sources/sinks, selected zones, and summary of the solution data. The dialog contains the following option:

  • Precision – Sets the precision of the decimal values in the dialog.

Unsupported Features

In GMS, some features of MODFLOW 6 are not yet supported or only have minimal support. These include:

  • MODFLOW 6 features
    • Only support for one SOLUTIONGROUP in the mfsim.nam file
    • ‘NONE’ for cellid in SFR PACKAGEDATA block is not supported
    • IPRN variable for arrays
    • Advanced package output files
    • Only the '#' character is supported for comments and not '!' or '//'
  • GMS interface functionality
    • Conceptual model approach for some packages
    • Observations coverage
    • Cell properties for array-based RCH and EVT packages

The MODFLOW 6 export option does not function with projects that are incompatible with MODFLOW 6. Projects with unsupported features or parameters will not be successfully exported.

Not all MODFLOW packages are supported in MODFLOW 6. The following table shows the correlation between MODFLOW 6 packages and packages from previous versions of MODFLOW.

MODFLOW 6 supported packages Equivalent Mf2k5/USG package
CHD, DRN, GHB, RIV, WEL CHD, DRN, GHB, RIV, WEL
DIS, DISV, DISU, TDIS DIS, DISU
EVT, RCH EVT, ETS, RCH
GNC GNC
IC BAS
LAK LAK
MAW MNW2
NPF, STO BCF, HUF, LPF, UPW
SFR SFR
UZF UZF
MVR, GWF, OBS Not supported
Not Supported DRT, GAGE, MNW1, MNWI, STR, SUB, SWI, OBS, HOB, CHOB, RVOB, STOB, DROB

MODFLOW 6 Files

The files generated for MODFLOW 6 will appear similar to those created for other versions of MODFLOW. The *.mfn.log file will contain notes about the export and mention any items that could not be exported for MODFLOW 6.

For more details, see the MODFLOW 6 Input and Output document

External Link


v • e
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