b-p bbb bbi bbm bbo bbp bbr bbs bbt bi- bib bii bim bio bip bir bis bit bmb bmi bmm bmo bmp bmr bms bmt bob boi bom boo bop bor bos bot bpb bpi bpm bpo bpp bpr bps bpt brb bri brm bro brp brr brs brt bsb bsi bsm bso bsp bsr bss bst btb bti btm bto btp btr bts btt ibb ibi ibm ibo ibp ibr ibs ibt iib iii iim iio iip iir iis iit im- imb imi imm imo imp ims imt io- iob ioi iom ioo iop ior ios iot ipb ipi ipm ipo ipp ipr ips ipt ir- irb iri irm iro irp irr irs irt is- isb isi ism iso isp isr iss ist itb iti itm ito itp its itt m-o m-r mbb mbi mbm mbo mbp mbr mbs mbt mi- mib mii mim mio mip mir mis mit mmb mmi mmm mmo mmp mmr mms mmt mob moi mom moo mop mor mos mot mpb mpi mpm mpo mpp mpr mps mpt mrb mri mrm mro mrp mrr mrs mrt msb msi msm mso msp msr mss mst mtb mti mtm mto mtp mtr mts mtt o-i ob- obb obi obm obo obp obr obs obt oib oii oim oio oip oir ois oit om- omb omi omm omo omp omr oms omt oo- oob ooi oom ooo oop oor oos oot op- opb opi opm opo opp opr ops opt or- orb ori orm oro orp orr ors ort os- osb osi osm oso osp osr oss ost ot- otb oti otm oto otp otr ots ott p-p pbb pbi pbm pbo pbp pbr pbs pbt pib pii pim pio pip pir pis pit pmb pmi pmm pmo pmp pmr pms pmt pob poi pom poo pop por pos pot ppb ppi ppm ppo ppp ppr pps ppt prb pri prm pro prp prr prs prt ps- psb psi psm pso psp psr pss pst pt- ptb pti ptm pto ptp ptr pts ptt rbb rbi rbm rbo rbp rbr rbs rbt rib rii rim rio rip rir ris rit rmb rmi rmm rmo rmp rmr rms rmt rob roi rom roo rop ror ros rot rpb rpi rpm rpo rpp rpr rps rpt rrb rri rrm rrp rrr rrs rrt rsb rsi rsm rso rsp rsr rss rst rtb rti rtm rto rtp rtr rts rtt sbb sbi sbm sbo sbp sbr sbs sbt sib sii sim sio sip sir sis sit smb smi smm smo smp smr sms smt sob soi som soo sop sor sos sot spb spi spm spo spp spr sps spt sr- srb sri srm sro srp srr srs srt ss- ssb ssi ssm sso ssp ssr sss sst stb sti stm sto stp str sts stt tbb tbi tbm tbo tbp tbr tbs tbt tib tii tim tio tip tir tis tit tmb tmi tmm tmo tmp tmr tms tmt to- tob toi tom too top tor tos tot tpb tpi tpm tpo tpp tpr tps tpt trb tri trm tro trp trr trs trt tsb tsi tsm tso tsp tsr tss tst ttb tti ttm tto ttp ttr tts ttt