-ic b-u bbb bbc bbi bbl bbr bbt bbu bcb bcc bci bcl bcr bct bcu bi- bib bic bii bil bir bit biu blb blc bli bll blr blt blu brb bri brl brr brt bru btb btc bti btl btr btt btu bub buc bui bul bur but buu c-- cbb cbc cbi cbl cbr cbt cbu ccb ccc cci ccl ccr cct ccu ci- cib cic cii cil cir cit ciu cl- clb clc cli cll clr clt clu crb crc cri crl crr crt cru ctb ctc cti ctl ctr ctt ctu cub cuc cui cul cur cut cuu ibb ibc ibi ibl ibr ibt ibu icb icc ici icl icr ict icu iib iic iii iil iir iit iiu il- ilb ilc ili ill ilr ilt ilu ir- irb irc iri irl irr irt iru itb itc iti itl itt itu iu- iub iuc iui iur iut lbb lbc lbi lbl lbr lbt lbu lcb lcc lci lcl lcr lct lcu lib lic lii lil lir lit liu llb llc lli lll llr llt llu lrb lrc lri lrr lrt lru ltb ltc lti ltl ltr ltt ltu lub luc lui lul lur lut luu rbb rbc rbi rbl rbr rbt rbu rcb rcc rci rcl rcr rct rcu rib ric rii ril rir rit rlc rli rll rlr rlt rlu rrb rrc rri rrl rrr rrt rru rtb rtc rti rtl rtr rtt rtu rub ruc rui rur rut ruu tbb tbc tbi tbl tbr tbt tbu tcb tcc tci tcl tcr tct tcu tib tic tii til tir tit tiu tlc tli tll tlr tlt tlu trb trc tri trl trr trt tru ttb ttc tti ttl ttr ttt ttu tub tuc tui tul tur tut tuu ubb ubc ubi ubl ubr ubt ubu ucb ucc uci ucl ucr uct ucu uib uic uii uil uir uit uiu ulb ulc uli ull ulr ult ulu ur- urb urc uri url urr urt uru utb utc uti utl utr utt utu uuc uur uut uuu