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    #!/bin/perl
    #if your program doesn't begin with this, you deserve to fail...
    ...
           return $weight;
    }
    
  2. or download this
    Adding C (12)* 12
    Adding H (1.008)* 22
    Adding O (16)* 11
    Molecule: C12 H22 O11
    Weight of C12 H22 O11 : 342.176