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  1. or download this
    string1,string2,string3,string4
string3,string4
string1,string2,string3
  2. or download this
    %hash{'string1'}{'string2'}{'string3'}{'string4'}++;
%hash{'string3'}{'string4'}++;
%hash{'string1'}{'string2'}{'string3'}++;
  3. or download this
    foreach my $k1 (keys %hash){
  foreach my $k2 (keys %hash{$k1}){
...
  }
}