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  1. or download this
      DB<24> $h{length}=3
 => 3

  DB<25> \%h
 => { length => 3 }
  2. or download this
      DB<33> $_="abc"
 => "abc"
...

  DB<38> \%h
 => { 3 => 42, 4 => 666, length => 3 }
  3. or download this
      DB<39> $h{length $_}= 'best'
 => "best"

  DB<40> \%h
 => { 3 => 42, 4 => "best", length => 3 }