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  1. or download this
    my %hash = (
   a => [ '1','2', ],
   b => [ '2','3', ],
   c => [ '1','2', ],
);
say "$_ => $hash{$_}" for keys %hash;
  2. or download this
    c => ARRAY(0x1abd8f0)
a => ARRAY(0x1a9f998)
b => ARRAY(0x1abd7a0)