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Question: Compute indices of variables in Maple

Question:Compute indices of variables in Maple

lijr07 25 Maple
programming
August 20 2016
1

I want to define a function f in Maple such that $f(x[1,2]^{-1/3})=\{1,2\}, f(x[1,2])=\{1,2\}, f(x[1])=\{1\}, f(x[1]^{1/3}) =\{1\}$, f(x)=empty set. How could I do this in Maple? Thank you very much.
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