foreach my $value (%top_words)

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I think you mean reverse( sort keys(%top_words)) there.

Also see perlfaq4 on How do I sort a hash (optionally by value instead of key)?. Your approach loses one of the keys whenever two keys have the same value.

In reply to Re: Printing keys from a hash by value? by Corion
in thread Printing keys from a hash by value? by jms53

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