oo- ooo oos oot os- oso oss ost osu ot- oto ots ott otu ou- ouo ous out oyo oys soo sos sot sou soy ss- sso sss sst ssu sto sts stt stu sty suo sus sut suu suy sy- sys syt syu to- too tos tot tou toy tso tss tst tsu tsy tto tts ttt ttu tty tuo tus tut tuu tuy tyo tys tyt uoo uos uot uso uss ust usu uto uts utt utu uty uus uut uuu uyo uys uyu yoo yos yot you yoy yso yss yst ysu ysy yto yts ytt ytu yuo yus yut yuu yuy yys yyt yyu yyy