It derives from the Old English twelf and tuelf, first attested in the 10th-century Lindisfarne Gospels' Book of John. [n 1] It has cognates in every Germanic language (e. g. German zwölf), whose Proto-Germanic ancestor has been reconstructed as *twaliƀi. . . , from *twa ("two") and suffix *-lif- or *-liƀ- of uncertain meaning. It is sometimes compared with the Lithuanian dvýlika, although -lika is used as the suffix for all numbers from 11 to 19 (analogous to "-teen"). Every other Indo-European language instead uses a form of "two"+"ten", such as the Latin duōdecim. The usual ordinal form is "twelfth" but "dozenth" or "duodecimal" (from the Latin word) is also used in some contexts, particularly base-12 numeration. Similarly, a group of twelve things is usually a "dozen" but may also be referred to as a "dodecad" or "duodecad". The adjective referring to a group of twelve is "duodecuple".