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  1. or download this
    perl -e '$_[0]={1,1,2,2};keys %$_[0]'     # no
perl -e '$_[0]={1,1,2,2};print ref $_[0]' # wtf
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  2. or download this
    $ perl -E'$_[0]={1,1,2,2};say keys %{$_[0]}'   # ttf°
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