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Subsequence medium #union

by jiangshan @jiangshanmeta

Take the Challenge

Given an array of unique elements, return all possible subsequences.

A subsequence is a sequence that can be derived from an array by deleting some or no elements without changing the order of the remaining elements.

For example:

type A = Subsequence<[1, 2] // [] | [1] | [2] | [1, 2]

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