-ic bbb bbc bbi bbm bbo bbr bbt bcb bcc bci bcm bco bcr bct bi- bib bic bii bim bio bir bit bmb bmc bmi bmm bmo bmr bmt bob boc boi bom boo bor bot brb bri brm bro brr brt btb btc bti btm bto btr btt c-- cbb cbc cbi cbm cbo cbr cbt ccb ccc cci ccm cco ccr cct ci- cib cic cii cim cio cir cit cmb cmc cmi cmm cmo cmr cmt co- cob coc coi com coo cor cot crb crc cri crm cro crr crt ctb ctc cti ctm cto ctr ctt ibb ibc ibi ibm ibo ibr ibt icb icc ici icm ico icr ict iib iic iii iim iio iir iit im- imb imc imi imm imo imt io- iob ioc ioi iom ioo ior iot ir- irb irc iri irm iro irr irt itb itc iti itm ito itt m-o m-r mbb mbc mbi mbm mbo mbr mbt mc- mcb mcc mci mcm mco mcr mct mi- mib mic mii mim mio mir mit mmb mmc mmi mmm mmo mmr mmt mob moc moi mom moo mor mot mrb mrc mri mrm mro mrr mrt mtb mtc mti mtm mto mtr mtt o-i ob- obb obc obi obm obo obr obt oc- ocb occ oci ocm oco ocr oct oib oic oii oim oio oir oit om- omb omc omi omm omo omr omt oo- oob ooc ooi oom ooo oor oot or- orb orc ori orm oro orr ort ot- otb otc oti otm oto otr ott rbb rbc rbi rbm rbo rbr rbt rcb rcc rci rcm rco rcr rct rib ric rii rim rio rir rit rmb rmc rmi rmm rmo rmr rmt rob roc roi rom roo ror rot rrb rrc rri rrm rrr rrt rtb rtc rti rtm rto rtr rtt tbb tbc tbi tbm tbo tbr tbt tcb tcc tci tcm tco tcr tct tib tic tii tim tio tir tit tmb tmc tmi tmm tmo tmr tmt to- tob toc toi tom too tor tot trb trc tri trm tro trr trt ttb ttc tti ttm tto ttr ttt