oo- ooo oop oos oot op- opo opp ops opt opy os- oso osp oss ost ot- oto otp ots ott oyo oys p-p poo pop pos pot poy ppo ppp pps ppt ps- pso psp pss pst psy pt- pto ptp pts ptt pty py- pyo pys pyt soo sop sos sot soy spo spp sps spt spy ss- sso ssp sss sst sto stp sts stt sty sy- syp sys syt to- too top tos tot toy tpo tpp tps tpt tso tsp tss tst tsy tto ttp tts ttt tty tyo typ tys tyt yoo yop yos yot yoy ypo yps yso ysp yss yst ysy yto ytp yts ytt yys yyt yyy