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  1. or download this
    #         1         2         3         4         5         
#1234567890123456789012345678901234567890123456789012345678 
...
#map{print$j=''if$l!=$_;print++$i.") $_-".++$j;$l=$_}@_
#map{print''if!$A{$_};print++$i.") $_-".++$A{$_}}@_
 print$A{$_}?'':$/,++$i.") $_-".++$A{$_}for@_
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     print!$A{$_}&&$/,++$i.") $_-".++$A{$_}for@_
  3. or download this
     print!$A{$_}++&&$/,++$i.") $_-$A{$_}"for@_
  4. or download this
     print$/x!$A{$_}++,++$i.") $_-$A{$_}"for@_