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  1. or download this
    #! perl
use strict;
...

$HASH{keyB}{keyA} = $array_ref;
dd \%HASH;
  2. or download this
    23:53 >perl 1360_SoPW.pl
{ keyA => { keyB => [1 .. 4] } }
{ keyB => { keyA => [1 .. 4] } }

23:53 >