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Wrap must/1 over parts of your code you do not trust
If your code fails.. it will rewind to your entry block (at the scope of this declaration) and invoke rtrace/1 .
If there are 50 steps to your code, it will save you from pushing
creep 50 times.
Instead it turns off the leash to allow you to trace with your eyeballs instead of your fingers.
% must( :Goal) is semidet.
Must Be Successfull.