Ummm.... no doubt I'm missing something here, but when I test these functions on certain sets of values, only the first works, because sort insists on doing a lexical rather than a numeric sort.

print join(",",nn1(1,5,34,43,123,444)), "\n";
print join(",",nn2(1,5,34,43,123,444)), "\n";
print join(",",nn3(1,5,34,43,123,444)), "\n";
1,5
34,43
1,123
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