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usage: FREESPACE(address,length)

-returns a block of memory of a given length to the interpreter's internal pool. The address argument must be a 4-byte string obtained by a prior call to GETSPACE()
-not always necessary to release allocated internally allocated memory, since ARexx releases it to the system when the program terminates.

-calling FREESPACE() with no arguments returns the amount of memory available in the interpreter's internal pool.