Free Energy Perturbation and OSRW Keywords
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**OSRW-ELE []**

**OSRW-LAMBDA [real]**
This keyword sets the internal logical flag for OSRW to `true` and provides
the initial value of lambda.

**OSRW-TORS []**

**OSRW-VDW []**

**ROTATABLE-BOND [integer list]**
