-er -ey b-u bbb bbc bbe bbo bbr bbt bbu bby bcb bcc bce bco bcr bct bcu bcy be- beb bec bee beo ber bet beu bey bob boc boe boo bor bot bou boy brb bre bro brr brt bru bry btb btc bte bto btr btt btu bty bub buc bue buo bur but buu buy by- byc bye byo byr byt byu c-- cbb cbc cbe cbo cbr cbt cbu cby ccb ccc cce cco ccr cct ccu ce- ceb cec cee ceo cer cet ceu cey co- cob coc coe coo cor cot cou coy crb crc cre cro crr crt cru cry ctb ctc cte cto ctr ctt ctu cty cub cuc cue cuo cur cut cuu cuy cyb cyc cye cyo cyr cyt ebb ebc ebe ebo ebr ebt ebu eby ec- ecb ecc ece eco ecr ect ecu eeb eec eee eeo eer eet eey eo- eob eoc eoe eoo eor eot eou erb erc ere ero err ert eru ery etb etc ete eto etr ett etu ety eu- eub euc eue eur eut eyc eye eyo eyr eyt ob- obb obc obe obo obr obt obu oby oc- ocb occ oco ocr oct ocu oeb oec oee oeo oer oet oey oo- oob ooc ooo oor oot or- orb orc ore oro orr ort oru ory ot- otb otc ote oto otr ott otu ou- ouc oue ouo our out oye oyo rbb rbc rbe rbo rbr rbt rbu rcb rcc rce rco rcr rct rcu re- reb rec ree reo rer ret reu rey rob roc roe roo ror rot rou roy rrb rrc rrr rrt rru rtb rtc rte rto rtr rtt rtu rty rub ruc rue ruo rur rut ruu ruy ry- ryc rye ryo ryr ryu ryy tbb tbc tbe tbo tbr tbt tbu tcb tcc tce tco tcr tct tcu te- teb tec tee teo ter tet teu tey to- tob toc toe too tor tot tou toy trb trc tre tro trr trt tru try ttb ttc tte tto ttr ttt ttu tty tub tuc tue tuo tur tut tuu tuy tyc tye tyo tyr tyt ubb ubc ube ubo ubr ubt ubu uby ucb ucc uce uco ucr uct ucu ueb uec uee uer uet uey uob uoc uoe uoo uor uot ur- urb urc ure uro urr urt uru ury utb utc ute uto utr utt utu uty uuc uue uur uut uuu uyc uyo uyu ybc ybe ybr yby ycc yce yco ycu ycy yeb yec yee yeo yer yet yey yob yoc yoe yoo yor yot you yoy yrc yre yro yrt yru ytc yte yto ytr ytt ytu yue yuo yur yut yuu yuy yyb yyc yye yyt yyu yyy