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The second argument is the comma separated set of strings. If the first string expands 'empty', it is considered to be '''not''' in the set. The comma separated set is not expanded.
===<cmd>doifcommon</cmd>, <cmd>doifnotcommon</cmd>, <cmd>doifnotcommondoifcommonelse</cmd> ===
Probably the most time consuming tests are those that test for overlap in sets of strings.

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