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  • I'll update it with the simpler solution, but I'd rather keep both if you don't mind. The mark-less (sic) method works fine for many simple configurations, but fails insidiously in more complex cases. This is how I first started using it, after all. :) Commented May 22, 2012 at 21:10
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    shouldn't $MASK be $MARK? Commented May 23, 2012 at 17:55