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    <S> ::= <SS>
       <W> ::= <V>
       <V> ::= <SS>
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    <V> ::= <SS>
       <W> ::= <V>
       <S> ::= <SS>
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      while($line=<>)
{
 chomp $line;
...
 push(@{$hasharr{$head}}, $prod);
 
}