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  1. or download this
    lanx@nc10-ubuntu:~$ perl -e '@k=( %h=(a=>42,b=>2,a=>1) ); print "$] Bu
+g: @k\n" unless @k ~~ [%h]'
5.010000 Bug: b 2 b 2
  2. or download this
    lanx@nc10-ubuntu:~$ perl -e '%h2=@k=( %h=(a=>42,b=>2,a=>1) ); delete @
+h{keys %h2}; print "$] Bug: @k\n" if %h'
5.010000 Bug: b 2 b 2