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  1. or download this
    my %hash1 = (a=>4,b=>5,c=>6,d=>7);
    my %hash2 = (a=>4,b=>5,c=>6,e=>7);
    ...
    
    hash1 only: d
    hash2 only: e
    
  2. or download this
    my %hash1 = (a=>4,b=>5,c=>6,d=>7);
    my %hash2 = (a=>4,b=>5,c=>6,e=>7);
    ...
    
    hash1 only: d
    hash2 only: e
    
  3. or download this
    my %hash1 = (a=>4,b=>5,c=>6,d=>7);
    my %hash2 = (a=>4,b=>5,c=>6,e=>7);
    ...
    
    hash1 only: d
    hash2 only: e