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While this example is obviously trivial, the strength of advice, especially when compared to similar facilities such as [[Python_syntax_and_semantics#Decorators|Python decorators]] and [[Java annotations]], lies in the fact that not only do the advised functions / methods not need to be designed to accept advice, but also the advice themselves need not be designed to be usable as advice - they're just normal functions. The availability of [[eval|evaluation]] throughout the lifetime of a piece of code (cf. [[Multi-stage programming|code staging]]) in Lisp allows advice to be [[Inline expansion|inlined]] automatically into any other code in a variety of ways. Any piece of code can be advised to carry out any other computation before, after, around, or instead of its original definition.
====Readability====
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