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  1. or download this
    <exm>This is example 1
    <exm>This is example 2
    <exm>This is example 3
    <exm>This is example 4
    
  2. or download this
    <exm num="1">This is example 1
    <exm num="2">This is example 2
    <exm num="3">This is example 3
    <exm num="4">This is example 4
    
  3. or download this
    $_ =~ s/<exm>/'<exm num="'.$exmno++.'">'/egs;
    if ($_ != /<exm>/g) {$exmno=0}