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  1. or download this
    sub file_merge {
      my $hash_ref = shift;
    ...
        push @{$hash_ref->{$key}}, [ @values ];
      }
    }
    
  2. or download this
    sub file_merge {
      my $filename = shift;
    ...
    
      return %hash;
    }
    
  3. or download this
    my %msisdn = file_merge('/tmp/subscription_list');
    my %calls  = file_merge('/tmp/Call_Det');