-ic bbb bbc bbi bbk bbm bbo bbr bbs bbt bcb bcc bci bck bcm bco bcr bcs bct bi- bib bic bii bik bim bio bir bis bit bkb bkc bkk bkm bko bkr bks bkt bmb bmc bmi bmk bmm bmo bmr bms bmt bob boc boi bok bom boo bor bos bot brb bri brk brm bro brr brs brt bsb bsc bsi bsk bsm bso bsr bss bst btb btc bti btk btm bto btr bts btt c-- cbb cbc cbi cbk cbm cbo cbr cbs cbt ccb ccc cci cck ccm cco ccr ccs cct ci- cib cic cii cik cim cio cir cis cit ckb ckc cki ckm cko cks ckt cmb cmc cmi cmk cmm cmo cmr cms cmt co- cob coc coi cok com coo cor cos cot crb crc cri crk crm cro crr crs crt csb csc csi csk csm cso csr css cst ctb ctc cti ctk ctm cto ctr cts ctt ibb ibc ibi ibk ibm ibo ibr ibs ibt icb icc ici ick icm ico icr ics ict iib iic iii iim iio iir iis iit ikb ikc iki ikk iko ikr iks ikt im- imb imc imi imm imo ims imt io- iob ioc ioi iom ioo ior ios iot ir- irb irc iri irk irm iro irr irs irt is- isb isc isi isk ism iso isr iss ist itb itc iti itk itm ito its itt k-t kbb kbc kbi kbk kbm kbo kbr kbs kcb kcc kci kck kcm kcr kcs kct kib kic kii kik kim kio kir kis kit kkb kkc kki kkk kkm kkr kks kkt kmb kmc kmi kmk kmm kmo kms kmt kob koc koi kok kom koo kor kos kot krc kri krk kro krr krs krt ksb ksc ksi ksk ksm kso ksr kss kst ktb ktc ktk ktm kto ktr kts ktt m-o m-r mbb mbc mbi mbk mbm mbo mbr mbs mbt mc- mcb mcc mci mck mcm mco mcr mcs mct mi- mib mic mii mik mim mio mir mis mit mkb mkc mkk mkm mko mkr mks mkt mmb mmc mmi mmk mmm mmo mmr mms mmt mob moc moi mok mom moo mor mos mot mrb mrc mri mrk mrm mro mrr mrs mrt msb msc msi msk msm mso msr mss mst mtb mtc mti mtk mtm mto mtr mts mtt o-i ob- obb obc obi obk obm obo obr obs obt oc- ocb occ oci ock ocm oco ocr ocs oct oib oic oii oik oim oio oir ois oit okb okc oki okk oko okr oks om- omb omc omi omm omo omr oms omt oo- oob ooc ooi ook oom ooo oor oos oot or- orb orc ori ork orm oro orr ors ort os- osb osc osi osk osm oso osr oss ost ot- otb otc oti otk otm oto otr ots ott rbb rbc rbi rbk rbm rbo rbr rbs rbt rcb rcc rci rcm rco rcr rcs rct rib ric rii rik rim rio rir ris rit rkb rkc rkk rkm rko rks rkt rmb rmc rmi rmm rmo rmr rms rmt rob roc roi rok rom roo ror ros rot rrb rrc rri rrk rrm rrr rrs rrt rsb rsc rsi rsk rsm rso rsr rss rst rtb rtc rti rtk rtm rto rtr rts rtt sbb sbc sbi sbk sbm sbo sbr sbs sbt scb scc sci sck scm sco scr scs sct sib sic sii sik sim sio sir sis sit sk- skb skc ski skk skm sko skr sks skt smb smc smi smk smm smo smr sms smt sob soc soi sok som soo sor sos sot sr- srb src sri srk srm sro srr srs srt ss- ssb ssc ssi ssk ssm sso ssr sss sst stb stc sti stk stm sto str sts stt tbb tbc tbi tbk tbm tbo tbr tbs tbt tcb tcc tci tck tcm tco tcr tcs tct tib tic tii tik tim tio tir tis tit tkb tkc tkk tkm tko tkr tks tkt tmb tmc tmi tmk tmm tmo tmr tms tmt to- tob toc toi tok tom too tor tos tot trb trc tri trk trm tro trr trs trt tsb tsc tsi tsk tsm tso tsr tss tst ttb ttc tti ttk ttm tto ttr tts ttt