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boxingcardmanBurdick was great but he isn't the last word. Sugar added the "N" to N cards, for example. When faced with an issue that Burdick obviously did not fully catalog or analyze, adding to the catalog makes sense. I've identified several varieties of W529 and I've added the "-x" to each one because Burdick didn't cover them all.
Sic Gorgiamus Allos Subjectatos Nunc