KS_ydiaeresis
KC(6), KS_y, KS_Y, KS_yen, KS_ydiaeresis,
KC(7), KS_x, KS_X, KS_voidSymbol, KS_ydiaeresis,
{ { KS_dead_diaeresis, KS_y }, KS_ydiaeresis },
{ { KS_quotedbl, KS_y }, KS_ydiaeresis },