-er -ic b-u bbb bbc bbe bbi bbr bbt bbu bcb bcc bce bci bcr bct bcu be- beb bec bee bei ber bet beu bi- bib bic bie bii bir bit biu brb bre bri brr brt bru btb btc bte bti btr btt btu bub buc bue bui bur but buu c-- cbb cbc cbe cbi cbr cbt cbu ccb ccc cce cci ccr cct ccu ce- ceb cec cee cei cer cet ceu ci- cib cic cie cii cir cit ciu crb crc cre cri crr crt cru ctb ctc cte cti ctr ctt ctu cub cuc cue cui cur cut cuu ebb ebc ebe ebi ebr ebt ebu ec- ecb ecc ece eci ecr ect ecu eeb eec eee eer eet eib eic eie eii eir eit eiu erb erc ere eri err ert eru etb etc ete eti etr ett etu eu- eub euc eue eui eur eut ibb ibc ibe ibi ibr ibt ibu icb icc ice ici icr ict icu ie- iec iee iei ier iet iib iic iie iii iir iit iiu ir- irb irc ire iri irr irt iru itb itc ite iti itt itu iu- iub iuc iue iui iur iut rbb rbc rbe rbi rbr rbt rbu rcb rcc rce rci rcr rct rcu re- reb rec ree rei rer ret reu rib ric rie rii rir rit rrb rrc rri rrr rrt rru rtb rtc rte rti rtr rtt rtu rub ruc rue rui rur rut ruu tbb tbc tbe tbi tbr tbt tbu tcb tcc tce tci tcr tct tcu te- teb tec tee tei ter tet teu tib tic tie tii tir tit tiu trb trc tre tri trr trt tru ttb ttc tte tti ttr ttt ttu tub tuc tue tui tur tut tuu ubb ubc ube ubi ubr ubt ubu ucb ucc uce uci ucr uct ucu ueb uec uee uei uer uet uib uic uie uii uir uit uiu ur- urb urc ure uri urr urt uru utb utc ute uti utr utt utu uuc uue uur uut uuu