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  1. or download this
    my $h={ j=>{b=>"some value meaningful to another part of code"}};
  2. or download this
    return $h->{$l_id}->{$letter_code}
  if (defined $h->{$l_id}->{$letter_code});
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    my $h = {j=>{b=>{c=>"some other meaningful value"}}};
  4. or download this
    my $h = {j=>{b=>{c=>1}}};