b-p bbb bbi bbo bbp bbs bbt bby bi- bib bii bio bip bis bit biy bob boi boo bop bos bot boy bpb bpi bpo bpp bps bpt bpy bsb bsi bso bsp bss bst bsy btb bti bto btp bts btt bty by- byi byo byp bys byt ibb ibi ibo ibp ibs ibt iby iib iii iio iip iis iit io- iob ioi ioo iop ios iot ipb ipi ipo ipp ips ipt ipy is- isb isi iso isp iss ist isy itb iti ito itp its itt ity iyo iys iyt iyy o-i ob- obb obi obo obp obs obt oby oib oii oio oip ois oit oo- oob ooi ooo oop oos oot op- opb opi opo opp ops opt opy os- osb osi oso osp oss ost ot- otb oti oto otp ots ott oyi oyo oys p-p pbb pbi pbo pbp pbs pbt pby pib pii pio pip pis pit pob poi poo pop pos pot poy ppb ppi ppo ppp pps ppt ps- psb psi pso psp pss pst psy pt- ptb pti pto ptp pts ptt pty py- pyb pyo pys pyt sbb sbi sbo sbp sbs sbt sby sib sii sio sip sis sit sob soi soo sop sos sot soy spb spi spo spp sps spt spy ss- ssb ssi sso ssp sss sst stb sti sto stp sts stt sty sy- syb syi syp sys syt tbb tbi tbo tbp tbs tbt tib tii tio tip tis tit tiy to- tob toi too top tos tot toy tpb tpi tpo tpp tps tpt tsb tsi tso tsp tss tst tsy ttb tti tto ttp tts ttt tty tyo typ tys tyt ybi ybp ybs yby yii yio yip yis yit yob yoi yoo yop yos yot yoy ypo yps ysb ysi yso ysp yss yst ysy yto ytp yts ytt yyb yys yyt yyy