In the case of clusters of two or three consonants that do not follow the initial "s-" and "-w" rule or the double consonants:  ("ks" or "x"),  ("ps") and "qus" (which later did not exist in classical Greek), each consonant in the cluster is represented by a type CV sign that shares its consonant value: "ko-no-so" for "Knōsos", or "ku-ru-so" for "khrusos" (, "gold"). The vowels of these signs have been called "empty", "null", "extra", "dead" and other terms by various writers as they represent no sound. There were rules though, that governed the selection of the "empty" vowel and therefore determined which sign was to be used. The vowel had to be the same as the one of the first syllable following the cluster or, if at the end of the word, preceding: "ti-ri-po" with "ti-" (instead of "ta-", "te-" and so on) to match "-ri-". A rare exception occurs in words formed from "wa-na-ka", "wanax" (ϝάναξ, Homeric and Classical ἄναξ): "wa-na-ka-te" for "wanaktei" (dative), and "wa-na-ka-te-ro" for "wanakteros", the adjectival form. This exception may not have applied to all contexts, as an example of "wa-na-ka" that follows standard rules has emerged in Ayios Vasileios in Laconia. The text reads "wa-na-ko-to" (genitive) and is written on a sealing nodule dating to the late 14th or early 13th century, slightly earlier than other Linear B texts found on mainland Greece.