iii iio iip iis iit io- ioi ioo iop ios iot ipi ipo ipp ips ipt ipy is- isi iso isp iss ist isy iti ito itp its itt ity iyo iys iyt iyy o-i oii oio oip ois oit oo- ooi ooo oop oos oot op- opi opo opp ops opt opy os- osi oso osp oss ost ot- oti oto otp ots ott oyi oyo oys p-p pii pio pip pis pit poi poo pop pos pot poy ppi ppo ppp pps ppt ps- psi pso psp pss pst psy pt- pti pto ptp pts ptt pty py- pyo pys pyt sii sio sip sis sit soi soo sop sos sot soy spi spo spp sps spt spy ss- ssi sso ssp sss sst sti sto stp sts stt sty sy- syi syp sys syt tii tio tip tis tit tiy to- toi too top tos tot toy tpi tpo tpp tps tpt tsi tso tsp tss tst tsy tti tto ttp tts ttt tty tyo typ tys tyt yii yio yip yis yit yoi yoo yop yos yot yoy ypo yps ysi yso ysp yss yst ysy yto ytp yts ytt yys yyt yyy