[INTERNAL] 

::

 get_free(self) -> [str]

Get free variables as a string.

Extra doc: https://github.com/casadi/casadi/wiki/L_1x9

Doc source: https://github.com/casadi/casadi/blob/develop/casadi/core/function.hpp#L1009

Implementation: https://github.com/casadi/casadi/blob/develop/casadi/core/function.cpp#L1128-L1130

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