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							You can do quite a lot, but you can't do everything.
								
 
 (If you heard my Scalar::Approxtalk,
								 you'll know about the difficulties I encountered trying
								 to make that work with lexical variables)
 
 You're restricted by the mechanisms that Perl provides.
								 You can't make utterly arbitrary changes to code behaviour.
								 
 
 Now we'll look at a way that you could make utterly
								 arbitrary changes, without restriction.
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