-ic bbb bbc bbi bbm bbr bbt bcb bcc bci bcm bcr bct bi- bib bic bii bim bir bit bmb bmc bmi bmm bmr bmt brb bri brm brr brt btb btc bti btm btr btt c-- cbb cbc cbi cbm cbr cbt ccb ccc cci ccm ccr cct ci- cib cic cii cim cir cit cmb cmc cmi cmm cmr cmt crb crc cri crm crr crt ctb ctc cti ctm ctr ctt ibb ibc ibi ibm ibr ibt icb icc ici icm icr ict iib iic iii iim iir iit im- imb imc imi imm imt ir- irb irc iri irm irr irt itb itc iti itm itt m-r mbb mbc mbi mbm mbr mbt mc- mcb mcc mci mcm mcr mct mi- mib mic mii mim mir mit mmb mmc mmi mmm mmr mmt mrb mrc mri mrm mrr mrt mtb mtc mti mtm mtr mtt rbb rbc rbi rbm rbr rbt rcb rcc rci rcm rcr rct rib ric rii rim rir rit rmb rmc rmi rmm rmr rmt rrb rrc rri rrm rrr rrt rtb rtc rti rtm rtr rtt tbb tbc tbi tbm tbr tbt tcb tcc tci tcm tcr tct tib tic tii tim tir tit tmb tmc tmi tmm tmr tmt trb trc tri trm trr trt ttb ttc tti ttm ttr ttt