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27,28c27,28 < $s1 =~ /^\d+$/ and $s2 =~ /^\d$/ and ... --- > $s1 =~ /^\d+$/ && $s2 =~ /^\d$/ and > &$f($v1 + 10 * $v2, $s1 . $s2);
24 = (3 * (14 - 6)) 24 = (6 / (1 - (3 / 4))) 24 = ((14 - 6) * 3)