## 5.8. RULES and VARIABLES Files

The `RULES` and `VARIABLES` files can be useful when editing a CCL file. They provide information on valid options, variables, and dependencies. Both files are located in <CFXROOT>/etc/ and can be viewed in any text editor.

Note: In some cases, the `RULES` and `VARIABLES` files contain information about variables, parameters, models and options that are not yet fully supported in the CFX-Solver. Use caution with features that are not documented elsewhere as these may cause the CFX-Solver to fail or produce invalid results.

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