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When asked to run, GAMS passes through a program file several times. The main passes it makes are the
| • | Compilation phase where the LST file is written containing an echo print of the source file possibly containing error messages, along with lists of GAMS objects, and cross reference maps. |
| • | Execution phase where output containing displays and execution error messages is added to the LST file. |
| • | Generation phase where output containing listings of equations and variables along with generation execution error messages is added to the LST file. |
| • | Solution phase where an external solver program deals with the model and creates output relative to the solution process is added to the LST file. |
| • | Post solution phase where output on the model solution and other user created displays is added to the LST file. |
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