If set to "true" ("false" is the default), an alphabetic year-suffix is added to ambiguous cites (e.g. "Doe 2007, Doe 2007" becomes "Doe 2007a, Doe 2007b") and to their corresponding bibliographic entries. The assignment of the year-suffixes follows the order of the bibliographies entries, and additional letters are used once "z" is reached ("z", "aa", "ab", ..., "az", "ba", etc.). By default the year-suffix is appended to the cite, and to the first year rendered through cs:date in the bibliographic entry, but its location can be controlled by explicitly rendering the "year-suffix" variable using cs:text. If "year-suffix" is rendered through cs:text in the scope of cs:citation, it is suppressed for cs:bibliography, unless it is also rendered through cs:text in the scope of cs:bibliography, and vice versa.