-er -ic b-u bbb bbc bbe bbg bbi bbo bbr bbt bbu bcb bcc bce bcg bci bco bcr bct bcu be- beb bec bee beg bei beo ber bet beu bgb bgc bge bgg bgi bgo bgr bgt bgu bi- bib bic bie big bii bio bir bit biu bob boc boe bog boi boo bor bot bou brb bre brg bri bro brr brt bru btb btc bte btg bti bto btr btt btu bub buc bue bug bui buo bur but buu c-- cbb cbc cbe cbg cbi cbo cbr cbt cbu ccb ccc cce ccg cci cco ccr cct ccu ce- ceb cec cee ceg cei ceo cer cet ceu cgb cgc cge cgg cgi cgo cgr cgt cgu ci- cib cic cie cig cii cio cir cit ciu co- cob coc coe cog coi coo cor cot cou crb crc cre crg cri cro crr crt cru ctb ctc cte ctg cti cto ctr ctt ctu cub cuc cue cug cui cuo cur cut cuu ebb ebc ebe ebg ebi ebo ebr ebt ebu ec- ecb ecc ece ecg eci eco ecr ect ecu eeb eec eee eeg eeo eer eet egb egc ege egg egi ego egr egt egu eib eic eie eig eii eio eir eit eiu eo- eob eoc eoe eog eoi eoo eor eot eou erb erc ere erg eri ero err ert eru etb etc ete etg eti eto etr ett etu eu- eub euc eue eug eui eur eut gbc gbe gbg gbi gbo gbr gbt gbu gcb gcc gce gcg gci gco gcr gct gcu ge- geb gec gee geg gei geo ger get geu ggb ggc ggg ggi ggo ggr ggt ggu gib gic gie gig gii gio gir git giu gob goc goe gog goi goo gor got gou grb grc gre grg gri gro grr grt gru gtb gtc gte gtg gti gto gtr gtt gtu gu- gub guc gue gug gui guo gur gut guu ibb ibc ibe ibg ibi ibo ibr ibt ibu icb icc ice icg ici ico icr ict icu ie- iec iee ieg iei ier iet igb igc ige igg igi igo igr igt igu iib iic iie iii iio iir iit iiu io- iob ioc ioe iog ioi ioo ior iot iou ir- irb irc ire irg iri iro irr irt iru itb itc ite itg iti ito itt itu iu- iub iuc iue iug iui iur iut o-i ob- obb obc obe obg obi obo obr obt obu oc- ocb occ ocg oci oco ocr oct ocu oeb oec oee oeg oei oeo oer oet ogc oge ogg ogi ogo ogt oib oic oie oii oio oir oit oiu oo- oob ooc oog ooi ooo oor oot or- orb orc ore org ori oro orr ort oru ot- otb otc ote otg oti oto otr ott otu ou- ouc oue oui ouo our out rbb rbc rbe rbg rbi rbo rbr rbt rbu rcb rcc rce rcg rci rco rcr rct rcu re- reb rec ree reg rei reo rer ret reu rgb rgc rge rgg rgi rgo rgr rgt rib ric rie rig rii rio rir rit rob roc roe rog roi roo ror rot rou rrb rrc rrg rri rrr rrt rru rtb rtc rte rtg rti rto rtr rtt rtu rub ruc rue rug rui ruo rur rut ruu tbb tbc tbe tbg tbi tbo tbr tbt tbu tcb tcc tce tcg tci tco tcr tct tcu te- teb tec tee teg tei teo ter tet teu tgb tgc tge tgg tgi tgo tgr tgt tgu tib tic tie tig tii tio tir tit tiu to- tob toc toe tog toi too tor tot tou trb trc tre trg tri tro trr trt tru ttb ttc tte ttg tti tto ttr ttt ttu tub tuc tue tug tui tuo tur tut tuu ubb ubc ube ubg ubi ubo ubr ubt ubu ucb ucc uce ucg uci uco ucr uct ucu ueb uec uee ueg uei uer uet ugb ugc uge ugg ugi ugo ugr ugt ugu uib uic uie uig uii uio uir uit uiu uob uoc uoe uog uoo uor uot ur- urb urc ure urg uri uro urr urt uru utb utc ute uti uto utr utt utu uuc uue uug uur uut uuu