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  1. or download this
    foreach my $key (sort keys %hash){
      print @{$hash{$key}}[0]; #prints a1 for first hash
      print @{$hash{$key}}[1]; #prints b1 for first hash
      print @{@{$hash{$key}}[2]}[0]; #prints c2a
    }
    
  2. or download this
    foreach my $key (sort keys %hash){
      print $hash{$key}->[0];
      print $hash{$key}->[1];
      print $hash{$key}->[2]->[0];
    }