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  1. or download this
       (exists $distinct{$v}) ? $overflow{$k} = $v
                          : $distinct{$v} = $k;
  2. or download this
      (  (exists $distinct{$v}) ? $overflow{$k} = $v
                            : $distinct{$v}  )
  = $k;
  3. or download this
      (exists $distinct{$v}) ? $overflow{$k} = $v = $k
                         : $distinct{$v} = $k
  4. or download this
    if( $distinct{$v} ) { $overflow{$k}= $v }
               else { $distinct{$v}= $k }