-ic bbb bbc bbi bbm bbo bbt bcb bcc bci bcm bco bct bi- bib bic bii bim bio bit bmb bmc bmi bmm bmo bmt bob boc boi bom boo bot btb btc bti btm bto btt c-- cbb cbc cbi cbm cbo cbt ccb ccc cci ccm cco cct ci- cib cic cii cim cio cit cmb cmc cmi cmm cmo cmt co- cob coc coi com coo cot ctb ctc cti ctm cto ctt ibb ibc ibi ibm ibo ibt icb icc ici icm ico ict iib iic iii iim iio iit im- imb imc imi imm imo imt io- iob ioc ioi iom ioo iot itb itc iti itm ito itt m-o mbb mbc mbi mbm mbo mbt mc- mcb mcc mci mcm mco mct mi- mib mic mii mim mio mit mmb mmc mmi mmm mmo mmt mob moc moi mom moo mot mtb mtc mti mtm mto mtt o-i ob- obb obc obi obm obo obt oc- ocb occ oci ocm oco oct oib oic oii oim oio oit om- omb omc omi omm omo omt oo- oob ooc ooi oom ooo oot ot- otb otc oti otm oto ott tbb tbc tbi tbm tbo tbt tcb tcc tci tcm tco tct tib tic tii tim tio tit tmb tmc tmi tmm tmo tmt to- tob toc toi tom too tot ttb ttc tti ttm tto ttt