-ic bbb bbc bbi bbk bbm bbo bbs bbt bcb bcc bci bck bcm bco bcs bct bi- bib bic bii bik bim bio bis bit bkb bkc bkk bkm bko bks bkt bmb bmc bmi bmk bmm bmo bms bmt bob boc boi bok bom boo bos bot bsb bsc bsi bsk bsm bso bss bst btb btc bti btk btm bto bts btt c-- cbb cbc cbi cbk cbm cbo cbs cbt ccb ccc cci cck ccm cco ccs cct ci- cib cic cii cik cim cio cis cit ckb ckc cki ckm cko cks ckt cmb cmc cmi cmk cmm cmo cms cmt co- cob coc coi cok com coo cos cot csb csc csi csk csm cso css cst ctb ctc cti ctk ctm cto cts ctt ibb ibc ibi ibk ibm ibo ibs ibt icb icc ici ick icm ico ics ict iib iic iii iim iio iis iit ikb ikc iki ikk iko iks ikt im- imb imc imi imm imo ims imt io- iob ioc ioi iom ioo ios iot is- isb isc isi isk ism iso iss ist itb itc iti itk itm ito its itt k-t kbb kbc kbi kbk kbm kbo kbs kcb kcc kci kck kcm kcs kct kib kic kii kik kim kio kis kit kkb kkc kki kkk kkm kks kkt kmb kmc kmi kmk kmm kmo kms kmt kob koc koi kok kom koo kos kot ksb ksc ksi ksk ksm kso kss kst ktb ktc ktk ktm kto kts ktt m-o mbb mbc mbi mbk mbm mbo mbs mbt mc- mcb mcc mci mck mcm mco mcs mct mi- mib mic mii mik mim mio mis mit mkb mkc mkk mkm mko mks mkt mmb mmc mmi mmk mmm mmo mms mmt mob moc moi mok mom moo mos mot msb msc msi msk msm mso mss mst mtb mtc mti mtk mtm mto mts mtt o-i ob- obb obc obi obk obm obo obs obt oc- ocb occ oci ock ocm oco ocs oct oib oic oii oik oim oio ois oit okb okc oki okk oko oks om- omb omc omi omm omo oms omt oo- oob ooc ooi ook oom ooo oos oot os- osb osc osi osk osm oso oss ost ot- otb otc oti otk otm oto ots ott sbb sbc sbi sbk sbm sbo sbs sbt scb scc sci sck scm sco scs sct sib sic sii sik sim sio sis sit sk- skb skc ski skk skm sko sks skt smb smc smi smk smm smo sms smt sob soc soi sok som soo sos sot ss- ssb ssc ssi ssk ssm sso sss sst stb stc sti stk stm sto sts stt tbb tbc tbi tbk tbm tbo tbs tbt tcb tcc tci tck tcm tco tcs tct tib tic tii tik tim tio tis tit tkb tkc tkk tkm tko tks tkt tmb tmc tmi tmk tmm tmo tms tmt to- tob toc toi tok tom too tos tot tsb tsc tsi tsk tsm tso tss tst ttb ttc tti ttk ttm tto tts ttt