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a = [1, 2, 3, 4]
[i for i in a for _ in range(i)]
# [1, 2, 2, 3, 3, 3, 4, 4, 4, 4]

A = [1, 2, 3, 4].
[I || I <- A, _ <- lists:seq(1, I)].
% [1,2,2,3,3,3,4,4,4,4]