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Sorting strings


Sorting this list of strings 

{"a1", "a2", "a20", "a12"} // Sort

I get

{"a1", "a12", "a2", "a20"}

but I would like the numerals to be sorted as numbers, i.e., as

{"a1", "a2", "a12",  "a20"}

Is this possible or do I have to rename "a1" into "a01" etc?

Thanks

Themis



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