-ic b-u bbb bbc bbi bbm bbr bbs bbt bbu bcb bcc bci bcm bcr bcs bct bcu bi- bib bic bii bim bir bis bit biu bmb bmc bmi bmm bmr bms bmt bmu brb bri brm brr brs brt bru bsb bsc bsi bsm bsr bss bst bsu btb btc bti btm btr bts btt btu bub buc bui bum bur bus but buu c-- cbb cbc cbi cbm cbr cbs cbt cbu ccb ccc cci ccm ccr ccs cct ccu ci- cib cic cii cim cir cis cit ciu cmb cmc cmi cmm cmr cms cmt cmu crb crc cri crm crr crs crt cru csb csc csi csm csr css cst csu ctb ctc cti ctm ctr cts ctt ctu cub cuc cui cum cur cus cut cuu ibb ibc ibi ibm ibr ibs ibt ibu icb icc ici icm icr ics ict icu iib iic iii iim iir iis iit iiu im- imb imc imi imm ims imt imu ir- irb irc iri irm irr irs irt iru is- isb isc isi ism isr iss ist isu itb itc iti itm its itt itu iu- iub iuc iui ium iur ius iut m-r mbb mbc mbi mbm mbr mbs mbt mbu mc- mcb mcc mci mcm mcr mcs mct mcu mi- mib mic mii mim mir mis mit miu mmb mmc mmi mmm mmr mms mmt mmu mrb mrc mri mrm mrr mrs mrt mru msb msc msi msm msr mss mst msu mtb mtc mti mtm mtr mts mtt mtu mub muc mui mum mur mus mut muu rbb rbc rbi rbm rbr rbs rbt rbu rcb rcc rci rcm rcr rcs rct rcu rib ric rii rim rir ris rit rmb rmc rmi rmm rmr rms rmt rrb rrc rri rrm rrr rrs rrt rru rsb rsc rsi rsm rsr rss rst rsu rtb rtc rti rtm rtr rts rtt rtu rub ruc rui rum rur rus rut ruu sbb sbc sbi sbm sbr sbs sbt sbu scb scc sci scm scr scs sct scu sib sic sii sim sir sis sit siu smb smc smi smm smr sms smt smu sr- srb src sri srm srr srs srt ss- ssb ssc ssi ssm ssr sss sst ssu stb stc sti stm str sts stt stu sub suc sui sum sur sus sut suu tbb tbc tbi tbm tbr tbs tbt tbu tcb tcc tci tcm tcr tcs tct tcu tib tic tii tim tir tis tit tiu tmb tmc tmi tmm tmr tms tmt tmu trb trc tri trm trr trs trt tru tsb tsc tsi tsm tsr tss tst tsu ttb ttc tti ttm ttr tts ttt ttu tub tuc tui tum tur tus tut tuu ubb ubc ubi ubr ubs ubt ubu ucb ucc uci ucm ucr ucs uct ucu uib uic uii uim uir uis uit uiu um- umb umc umi umm umr ums umt umu ur- urb urc uri urm urr urs urt uru usb usc usi usm usr uss ust usu utb utc uti utm utr uts utt utu uuc uum uur uus uut uuu