b-p bbb bbi bbk bbo bbp bbs bbt bi- bib bii bik bio bip bis bit bkb bkk bko bkp bks bkt bob boi bok boo bop bos bot bpb bpi bpo bpp bps bpt bsb bsi bsk bso bsp bss bst btb bti btk bto btp bts btt ibb ibi ibk ibo ibp ibs ibt iib iii iio iip iis iit ikb iki ikk iko iks ikt io- iob ioi ioo iop ios iot ipb ipi ipo ipp ips ipt is- isb isi isk iso isp iss ist itb iti itk ito itp its itt k-t kbb kbi kbk kbo kbp kbs kib kii kik kio kip kis kit kkb kki kkk kkp kks kkt kob koi kok koo kop kos kot kpi kpk kpo kpp kps kpt ksb ksi ksk kso ksp kss kst ktb ktk kto ktp kts ktt o-i ob- obb obi obk obo obp obs obt oib oii oik oio oip ois oit okb oki okk oko okp oks oo- oob ooi ook ooo oop oos oot op- opb opi opk opo opp ops opt os- osb osi osk oso osp oss ost ot- otb oti otk oto otp ots ott p-p pbb pbi pbk pbo pbp pbs pbt pib pii pik pio pip pis pit pkb pki pko pkp pks pkt pob poi pok poo pop pos pot ppb ppi ppk ppo ppp pps ppt ps- psb psi psk pso psp pss pst pt- ptb pti ptk pto ptp pts ptt sbb sbi sbk sbo sbp sbs sbt sib sii sik sio sip sis sit sk- skb ski skk sko skp sks skt sob soi sok soo sop sos sot spb spi spk spo spp sps spt ss- ssb ssi ssk sso ssp sss sst stb sti stk sto stp sts stt tbb tbi tbk tbo tbp tbs tbt tib tii tik tio tip tis tit tkb tkk tko tkp tks tkt to- tob toi tok too top tos tot tpb tpi tpk tpo tpp tps tpt tsb tsi tsk tso tsp tss tst ttb tti ttk tto ttp tts ttt