-er -ic b-u bbb bbc bbe bbi bbo bbr bbt bbu bcb bcc bce bci bco bcr bct bcu be- beb bec bee bei beo ber bet beu bi- bib bic bie bii bio bir bit biu bob boc boe boi boo bor bot bou brb bre bri bro brr brt bru btb btc bte bti bto btr btt btu bub buc bue bui buo bur but buu c-- cbb cbc cbe cbi cbo cbr cbt cbu ccb ccc cce cci cco ccr cct ccu ce- ceb cec cee cei ceo cer cet ceu ci- cib cic cie cii cio cir cit ciu co- cob coc coe coi coo cor cot cou crb crc cre cri cro crr crt cru ctb ctc cte cti cto ctr ctt ctu cub cuc cue cui cuo cur cut cuu ebb ebc ebe ebi ebo ebr ebt ebu ec- ecb ecc ece eci eco ecr ect ecu eeb eec eee eeo eer eet eib eic eie eii eio eir eit eiu eo- eob eoc eoe eoi eoo eor eot eou erb erc ere eri ero err ert eru etb etc ete eti eto etr ett etu eu- eub euc eue eui eur eut ibb ibc ibe ibi ibo ibr ibt ibu icb icc ice ici ico icr ict icu ie- iec iee iei ier iet iib iic iie iii iio iir iit iiu io- iob ioc ioe ioi ioo ior iot iou ir- irb irc ire iri iro irr irt iru itb itc ite iti ito itt itu iu- iub iuc iue iui iur iut o-i ob- obb obc obe obi obo obr obt obu oc- ocb occ oci oco ocr oct ocu oeb oec oee oei oeo oer oet oib oic oie oii oio oir oit oiu oo- oob ooc ooi ooo oor oot or- orb orc ore ori oro orr ort oru ot- otb otc ote oti oto otr ott otu ou- ouc oue oui ouo our out rbb rbc rbe rbi rbo rbr rbt rbu rcb rcc rce rci rco rcr rct rcu re- reb rec ree rei reo rer ret reu rib ric rie rii rio rir rit rob roc roe roi roo ror rot rou rrb rrc rri rrr rrt rru rtb rtc rte rti rto rtr rtt rtu rub ruc rue rui ruo rur rut ruu tbb tbc tbe tbi tbo tbr tbt tbu tcb tcc tce tci tco tcr tct tcu te- teb tec tee tei teo ter tet teu tib tic tie tii tio tir tit tiu to- tob toc toe toi too tor tot tou trb trc tre tri tro trr trt tru ttb ttc tte tti tto ttr ttt ttu tub tuc tue tui tuo tur tut tuu ubb ubc ube ubi ubo ubr ubt ubu ucb ucc uce uci uco ucr uct ucu ueb uec uee uei uer uet uib uic uie uii uio uir uit uiu uob uoc uoe uoo uor uot ur- urb urc ure uri uro urr urt uru utb utc ute uti uto utr utt utu uuc uue uur uut uuu