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254: 2018/03/22(Ψ)10:15:11.47 ID:mcQm+qkM(1/2) AAS
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305: 2020/01/11(y)13:07:12.47 ID:JM9/51Sk(3/6) AAS
use feature qw{say signatures};
sub rev($s) {
$s ne '' and sub($s, -1, 1, '') . rev($s)
}
say rev('string');
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Κ±Μθ Κ±TOP 0.552s*