[1.112] δισσοῦ οὖν ὄντος τοῦ α καὶ ι καὶ υ οὐκέτι ἑπτὰ γενήσεται μόνον στοιχεῖα φωνάεντα, ὧν δύο μὲν μακρά, τό τε η καὶ τὸ ω, δύο δὲ βραχέα, τό τε ε καὶ τὸ ο, τρία δὲ δίχρονα, τό τε α καὶ ι καὶ υ, ἀλλὰ τὰ σύμπαντα δέκα, καὶ τούτων τὰ πέντε μὲν μακρά, τό τε η καὶ τὸ ω καὶ τὸ μακρὸν α καὶ ι καὶ υ, ἰσάριθμα δὲ τὰ βραχέα, τὸ ο καὶ τὸ ε καὶ τὸ βραχὺ α καὶ ι καὶ υ.