iii iio iip iis iit io- ioi ioo iop ios iot ipi ipo ipp ips ipt is- isi iso isp iss ist iti ito itp its itt o-i oii oio oip ois oit oo- ooi ooo oop oos oot op- opi opo opp ops opt os- osi oso osp oss ost ot- oti oto otp ots ott p-p pii pio pip pis pit poi poo pop pos pot ppi ppo ppp pps ppt ps- psi pso psp pss pst pt- pti pto ptp pts ptt sii sio sip sis sit soi soo sop sos sot spi spo spp sps spt ss- ssi sso ssp sss sst sti sto stp sts stt tii tio tip tis tit to- toi too top tos tot tpi tpo tpp tps tpt tsi tso tsp tss tst tti tto ttp tts ttt