iii iio iir iis iit iix io- ioi ioo ior ios iot ir- iri iro irr irs irt irx iry is- isi iso isr iss ist isy iti ito its itt itx ity ixi ixy iyo iyr iys iyt iyy o-i oii oio oir ois oit oo- ooi ooo oor oos oot oox or- ori oro orr ors ort orx ory os- osi oso osr oss ost osx ot- oti oto otr ots ott ox- oxi oxo oxt oxx oxy oyi oyo oys rii rio rir ris rit rix riy roi roo ror ros rot rox roy rri rrr rrs rrt rsi rso rsr rss rst rsx rti rto rtr rts rtt rtx rty rxr rxs ry- ryo ryr rys ryy sii sio sir sis sit six soi soo sor sos sot sox soy sr- sri sro srr srs srt srx sry ss- ssi sso ssr sss sst ssx sti sto str sts stt stx sty sxi sxs sxt sy- syi syr sys syt syx t-x tii tio tir tis tit tix tiy to- toi too tor tos tot tox toy tri tro trr trs trt trx try tsi tso tsr tss tst tsx tsy tti tto ttr tts ttt ttx tty txi txs txt tyo tyr tys tyt xii xio xis xit xix xoi xoo xor xos xot xox xrt xrx xry xsi xss xst xti xtr xts xtx xty xxi xxo xxx xxy xyr xyy yii yio yir yis yit yoi yoo yor yos yot yox yoy yro yrs yrt ysi yso ysr yss yst ysy yto ytr yts ytt yxy yys yyt yyy