-er -ey b-u bbb bbc bbd bbe bbk bbr bbu bby bcb bcc bcd bce bck bcr bcu bcy bdb bdc bdd bde bdk bdr bdu bdy be- beb bec bed bee bek ber beu bey bkb bkc bke bkk bkr brb brd bre brk brr bru bry bub buc bud bue buk bur buu buy by- byc byd bye byk byr byu c-- cbb cbc cbd cbe cbk cbr cbu cby ccb ccc ccd cce cck ccr ccu cdb cdc cdd cde cdk cdr cdu cdy ce- ceb cec ced cee cek cer ceu cey ckb ckc ckd cky crb crc crd cre crk crr cru cry cub cuc cud cue cuk cur cuu cuy cyb cyc cyd cye cyk cyr dbb dbc dbd dbe dbk dbr dbu dby dcb dcc dcd dce dck dcr dcu ddb ddc ddd dde ddk ddr ddu ddy de- deb dec ded dee dek der deu dey dkb dkc dke dkk dkr dku drb drc drd dre drk drr dru dry dub duc dud due duk dur duy dy- dyb dyc dyd dye dyk dyr dyu dyy ebb ebc ebd ebe ebk ebr ebu eby ec- ecb ecc ecd ece eck ecr ecu ed- edb edc edd ede edk edr edu edy eeb eec eed eee eek eer eey ekb ekc ekd eke ekr eku eky erb erc erd ere erk err eru ery eu- eub euc eud eue eur eyc eyd eye eyr kbb kbc kbd kbe kbk kbr kbu kcb kcc kcd kce kck kcr kcu kdb kdc kde kdk kdr kdu kdy ke- keb kec ked kee kek ker key kkb kkc kke kkk kkr kku kky krc krd krk krr kru kry kub kuc kud kue kuk kur kuu kuy kyc kyd kye kyr kyu rbb rbc rbd rbe rbk rbr rbu rcb rcc rcd rce rcr rcu rdb rdc rdd rde rdr rdu rdy re- reb rec red ree rek rer reu rey rkb rkc rke rkk rku rky rrb rrc rrd rrk rrr rru rub ruc rud rue ruk rur ruu ruy ry- ryc ryd rye ryk ryr ryu ryy ubb ubc ube ubk ubr ubu uby ucb ucc ucd uce uck ucr ucu udb udc udd ude udk udr udu ueb uec ued uee uer uey ukb ukc uke ukk ukr uku ur- urb urc urd ure urk urr uru ury uuc uue uur uuu uyc uyu ybc ybe ybr yby ycc ycd yce ycu ycy yde ydy yeb yec yed yee yek yer yey ykk yrc yre yru yud yue yuk yur yuu yuy yyb yyc yye yyu yyy