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IN:  10:ab 21:bb 2:bb 21:bb 2:b
OUT: 2:b 2:bb 10:ab 21:ab 21:bb

IN:  bb:10 b:1 ab:10 ab:2 bb:9
OUT: ab:2 ab:10 b:1 bb:9 bb:10

$ perl -E 'say for sort { $a <=> $b } qw{020 2 02 20}'
2
...
2
20
020