four include both the "ND" and "SA" clauses, which are mutually exclusive; and one includes none of the clauses. Of the eleven valid combinations, the five that lack the "BY" clause have been retired because 98% of licensors requested attribution, though they do remain available for reference on the website. This leaves six regularly used licenses plus the CC0 public domain declaration.

Six regularly used licenses

The six licenses in most frequent use are shown in the following table.

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