Nihongo no Onso wo matomete mi-masu. Mazu, Boin wa "a, e, i, o, u" de, Han-Boin wa "w, y" desu. Tsugi ni, "Xa" de arawaseru "X" wa Dokuritsu shita Onso desu. ba, da, ga, ha, ka, ma, na, pa, ra, sa, ta, za Soshite, "Xi != Xyi" to naru "Xy"…