UNDEF symbol	- Undefine a symbol

Remove symbol from the symbol table list. The * wildcard character may 
be used. This character can only be used at the end of a symbol name and 
indicates a random number of characters. The symbol * can be used on its 
own and indicates ALL symbols - use with care!

UNDEF one      	Clear the symbol one
UNDEF PORT*    	Clear all macros whose names begin with the letters PORT
UNDEF *        	Clear all macros

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