Question: You are given an array of strings arr. A string s is formed by the concatenation of a subsequence of arr that has unique characters.

You are given an array of strings arr. A string s is formed by the concatenation of a subsequence of arr that has unique characters.

Return the maximum possible length of s

.

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

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