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5Each genus consists of eighteen sounds, which the Greeks call φθόγγοι (phthongi). Of these, eight sounds in each of the genera, vary neither in sound nor situation. The remaining ten in each are not common to the other two genera. Those which do not vary, contain between them the variable sounds, and are the limits of the tetrachords in all the genera. Their names are as follow: proslambanomenos, hypatè hypatôn, hypatè mesôn, mesè, netè synèmmenôn, paramesè, netè diezeugmenôn, netè hyperbolæôn. The variable, which lie between those that are not variable, change their places according to the genus. Their names are parhypatè hypatôn, lichanos hypatôn, parhypatè mesôn, lichanos mesôn,tritè synèmmenôn, paranetè synèmmenôn, tritè diezeugmenôn, paranetè diezeugmenôn, tritè hyperbolæôn, paranetè hyperbolæôn.
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