i-v iii iio iip iis iit io- ioi ioo iop ios iot iov ipi ipo ipp ips ipt ipv ipy is- isi iso isp iss ist isv isy iti ito itp its itt itv ity ivi ivo ivp ivs ivt ivv ivy iyo iys iyt iyy o-i oii oio oip ois oit oiv oo- ooi ooo oop oos oot oov op- opi opo opp ops opt opv opy os- osi oso osp oss ost osv ot- oti oto otp ots ott otv ov- ovi ovo ovp ovs ovv oyi oyo oys p-p pii pio pip pis pit piv poi poo pop pos pot pov poy ppi ppo ppp pps ppt ppv ps- psi pso psp pss pst psv psy pt- pti pto ptp pts ptt ptv pty pvi pvo pvp pvs pvt pvv py- pyo pys pyt sii sio sip sis sit siv soi soo sop sos sot sov soy spi spo spp sps spt spv spy ss- ssi sso ssp sss sst ssv sti sto stp sts stt stv sty svi svo svp svs svt svv svy sy- syi syp sys syt tii tio tip tis tit tiv tiy to- toi too top tos tot tov toy tpi tpo tpp tps tpt tpv tsi tso tsp tss tst tsv tsy tti tto ttp tts ttt ttv tty tvi tvo tvp tvs tvt tvy tyo typ tys tyt vi- vii vio vip vis vit viv viy voi voo vop vos vot vov voy vpi vpo vpp vps vpt vsi vso vsp vss vst vsv vti vto vts vtt vtv vty vvi vvo vvs vvt vvv vyp vyt yii yio yip yis yit yoi yoo yop yos yot yoy ypo yps ysi yso ysp yss yst ysy yto ytp yts ytt ytv yvi yvo yvy yys yyt yyy