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Positive Differences
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─────Positive Differences───────────────────────────────────────────────────
 
     DIM, IDIM, and DDIM return the positive difference of
     two arguments as follows:
 
     Situation         Result
 
     genA <= genB      DIM (genA, genB) = 0
 
     genA > genB       DIM (genA, genB) = genA-genB
                                    -♦-