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  1. or download this
    #! perl
use strict;
...
dd \%hash;
push @{ $hash{key1} }, 'abc';
dd \%hash;
  2. or download this
    17:39 >perl 994_SoPW.pl
{ key1 => [["a", "e", "i", "o", "u"], ["x", "y", "z"]] }
{ key1 => [["a", "e", "i", "o", "u"], ["x", "y", "z"], "abc"] }

17:39 >