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# MRCC_LEVEL

> Maximum excitation level. This is used ONLY if it is explicity set by the user. Single-reference case: all excitations up to this level are included, e.g., 2 for CCSD, 3 for CCSDT, 4 for CCSDTQ, etc. This becomes `ex.lev` (option #1) in fort.56.

> - Type: integer
> - Default: 2

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