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Language/Type: PHP recursion recursion mystery

For each call to the following recursive function, write the value that would be returned.

function recursion_mystery6($x, $y) {
    if ($x < $y) {
        return $x;
    } else {
        return recursion_mystery6($x - $y, $y);
recursion_mystery6(6, 13)
recursion_mystery6(14, 10)
recursion_mystery6(37, 10)
recursion_mystery6(8, 2)
recursion_mystery6(50, 7)

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