iii iio iip iir iis iit iix io- ioi ioo iop ior ios iot ipi ipo ipp ipr ips ipt ipx ipy ir- iri iro irp irr irs irt irx iry is- isi iso isp isr iss ist isy iti ito itp its itt itx ity ixi ixy iyo iyr iys iyt iyy o-i oii oio oip oir ois oit oo- ooi ooo oop oor oos oot oox op- opi opo opp opr ops opt opx opy or- ori oro orp orr ors ort orx ory os- osi oso osp osr oss ost osx ot- oti oto otp otr ots ott ox- oxi oxo oxt oxx oxy oyi oyo oys p-p pii pio pip pir pis pit pix poi poo pop por pos pot pox poy ppi ppo ppp ppr pps ppt ppx pri pro prp prr prs prt prx pry ps- psi pso psp psr pss pst psx psy pt- pti pto ptp ptr pts ptt ptx pty pxr pxs pxt py- pyo pyr pys pyt pyx rii rio rip rir ris rit rix riy roi roo rop ror ros rot rox roy rpi rpo rpp rpr rps rpt rpx rri rrp rrr rrs rrt rsi rso rsp rsr rss rst rsx rti rto rtp rtr rts rtt rtx rty rxp rxr rxs ry- ryo ryr rys ryy sii sio sip sir sis sit six soi soo sop sor sos sot sox soy spi spo spp spr sps spt spx spy sr- sri sro srp srr srs srt srx sry ss- ssi sso ssp ssr sss sst ssx sti sto stp str sts stt stx sty sxi sxs sxt sy- syi syp syr sys syt syx t-x tii tio tip tir tis tit tix tiy to- toi too top tor tos tot tox toy tpi tpo tpp tpr tps tpt tpx tri tro trp trr trs trt trx try tsi tso tsp tsr tss tst tsx tsy tti tto ttp ttr tts ttt ttx tty txi txs txt tyo typ tyr tys tyt xii xio xis xit xix xoi xoo xop xor xos xot xox xpo xpp xps xpt xrt xrx xry xsi xsp xss xst xti xtp xtr xts xtx xty xxi xxo xxp xxx xxy xyp xyr xyy yii yio yip yir yis yit yoi yoo yop yor yos yot yox yoy ypo yps yro yrp yrs yrt ysi yso ysp ysr yss yst ysy yto ytp ytr yts ytt yxy yys yyt yyy