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    for ($current_length = 1; $current_length >= $length_limit; $curre
+nt_length++)
    {
    ....
    }

    for ($current_length = 1; $current_length <= $length_limit; $curre
+nt_length++)
    {
    ....
    }

    for $current_length (1 .. $length_limit) {
    ....
    }