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    %{$self->{_hash}} = ();

    $self->{_hash} = {};

this is cat data
cat:a,b,c,d,e,fcat2:g,h,i,j,k,l,m
...
dog1:1,2,3,4,5,6,7dog2:21,22,23,24,25
this is dog keys
dog1dog2