-er -ic b-u bbb bbc bbe bbi bbl bbr bbt bbu bcb bcc bce bci bcl bcr bct bcu be- beb bec bee bei bel ber bet beu bi- bib bic bie bii bil bir bit biu blb blc ble bli bll blr blt blu brb bre bri brl brr brt bru btb btc bte bti btl btr btt btu bub buc bue bui bul bur but buu c-- cbb cbc cbe cbi cbl cbr cbt cbu ccb ccc cce cci ccl ccr cct ccu ce- ceb cec cee cei cel cer cet ceu ci- cib cic cie cii cil cir cit ciu cl- clb clc cle cli cll clr clt clu crb crc cre cri crl crr crt cru ctb ctc cte cti ctl ctr ctt ctu cub cuc cue cui cul cur cut cuu ebb ebc ebe ebi ebl ebr ebt ebu ec- ecb ecc ece eci ecl ecr ect ecu eeb eec eee eel eer eet eib eic eie eii eil eir eit eiu elb elc ele eli ell elr elt elu erb erc ere eri erl err ert eru etb etc ete eti etl etr ett etu eu- eub euc eue eui eul eur eut ibb ibc ibe ibi ibl ibr ibt ibu icb icc ice ici icl icr ict icu ie- iec iee iei iel ier iet iib iic iie iii iil iir iit iiu il- ilb ilc ile ili ill ilr ilt ilu ir- irb irc ire iri irl irr irt iru itb itc ite iti itl itt itu iu- iub iuc iue iui iur iut lbb lbc lbe lbi lbl lbr lbt lbu lcb lcc lce lci lcl lcr lct lcu leb lec lee lei lel ler let leu lib lic lie lii lil lir lit liu llb llc lle lli lll llr llt llu lrb lrc lri lrr lrt lru ltb ltc lte lti ltl ltr ltt ltu lub luc lue lui lul lur lut luu rbb rbc rbe rbi rbl rbr rbt rbu rcb rcc rce rci rcl rcr rct rcu re- reb rec ree rei rel rer ret reu rib ric rie rii ril rir rit rlc rle rli rll rlr rlt rlu rrb rrc rri rrl rrr rrt rru rtb rtc rte rti rtl rtr rtt rtu rub ruc rue rui rur rut ruu tbb tbc tbe tbi tbl tbr tbt tbu tcb tcc tce tci tcl tcr tct tcu te- teb tec tee tei tel ter tet teu tib tic tie tii til tir tit tiu tlc tle tli tll tlr tlt tlu trb trc tre tri trl trr trt tru ttb ttc tte tti ttl ttr ttt ttu tub tuc tue tui tul tur tut tuu ubb ubc ube ubi ubl ubr ubt ubu ucb ucc uce uci ucl ucr uct ucu ueb uec uee uei uel uer uet uib uic uie uii uil uir uit uiu ulb ulc ule uli ull ulr ult ulu ur- urb urc ure uri url urr urt uru utb utc ute uti utl utr utt utu uuc uue uur uut uuu