What is the function of this prolog program function?

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sources of topics and their own ideas

I want to know what the function of function an is, thank you

related codes

/ / Please paste the code text below (do not replace the code with pictures)
a ([], []).
a ([x | y], z):-a (y, w), append (w, [x], z).-sharp-sharp-sharp topic description

what result do you expect? What is the error message actually seen?

Prolog

Mar.10,2022

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