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#!/usr/bin/perl

...
          . " keys: ";
        print Dumper(\%hash);
}

tab@music4:~/Pianoforte/Development/Perlmonks/11113721 $ perl hashkeys
+.pl
At 11 there are 4 keys: $VAR1 = {
...
          '7' => 19
        };
tab@music4:~/Pianoforte/Development/Perlmonks/11113721 $