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<?php $seq = [20,1,-1,2,-2,3,3,5,5,1,2,4,20,4,-1,-2,5]; function findIt(array $seq) { $arr = array_count_values($seq); return array_keys(array_filter($arr, fn($el) => $el > 0 && $el % 2)); } print_r(findIt($seq)[0]);
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