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  1. or download this
    @A{ qw[ 1 2   4 6   ] } = qw[ a b   d f   ];
    @B{ qw[ 1 2 3 4 6 7 ] } = qw[ a b c d f g ];
    ...
    A:4.B:4
    A:6.B:6
       .B:7
    
  2. or download this
    print join'.', 
        ( exists $A{ $_ } ? 'A:' . $_ : '   ' ), 
    ...
    A:1.B:1
    A:6.B:6
       .B:7