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SYNOPSIS

   foldand0rule9_4.pl
   

Try inputs:

   a = 2*3+4   # Reducido a: a = 6
   a = 2*[3+b] # syntax error
   a = 2*3*b   # Reducido a: a = 6*b

Compile it with

         eyapp -m 'Calc' Rule9.yp 
         treereg -o T.pm -p 'R::' -m T Transform4