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Question: How to change sign in op?

Question:How to change sign in op?

ComputerUser 535 Maple 18
February 26 2016
0

f := a - b;
g := op(f);
seq(abs(g[i]), i=1..nops([g]));

i discover abs still in expression

how to result in [a,b] when input is [a,-b]
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