Take ["a", "b", "c"] as input and produce ["c-0", "b-1", "a-2"]. You can't use a for loop, only higher-order functions. Which functions would you combine, and in what order?
First reversed() to flip the order, then enumerated() to number the flipped order from 0, then map to interpolate element and index into a string. enumerated numbers whatever order it's called on, so reversed has to come first for c to get 0.
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