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Given an array of integers where every integer occurs three times except for one integer, which only occurs once, find and return the non-duplicated integer.

For example, given [6, 1, 3, 3, 3, 6, 6], return 1. Given [13, 19, 13, 13], return 19.

Do this in O(N) time and O(1) space.=
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using Test
include("Solutions/problem40_find_non_duplicated_int.jl")

@test nonduplicated([6, 1, 3, 3, 3, 6, 6]) == 1
@test nonduplicated([13, 19, 13, 13]) == 19
