-er -ey b-u bbb bbd bbe bbk bbo bbr bbu bby bdb bdd bde bdk bdo bdr bdu bdy be- beb bed bee bek beo ber beu bey bkb bke bkk bko bkr bob bod boe bok boo bor bou boy brb brd bre brk bro brr bru bry bub bud bue buk buo bur buu buy by- byd bye byk byo byr byu dbb dbd dbe dbk dbo dbr dbu dby ddb ddd dde ddk ddo ddr ddu ddy de- deb ded dee dek deo der deu dey dkb dke dkk dko dkr dku dob dod doe dok doo dor dou doy drb drd dre drk dro drr dru dry dub dud due duk duo dur duy dy- dyb dyd dye dyk dyo dyr dyu dyy ebb ebd ebe ebk ebo ebr ebu eby ed- edb edd ede edk edo edr edu edy eeb eed eee eek eeo eer eey ekb ekd eke eko ekr eku eky eo- eob eod eoe eok eoo eor eou erb erd ere erk ero err eru ery eu- eub eud eue eur eyd eye eyo eyr kbb kbd kbe kbk kbo kbr kbu kdb kde kdk kdo kdr kdu kdy ke- keb ked kee kek keo ker key kkb kke kkk kkr kku kky kob kod koe kok koo kor kou koy krd krk kro krr kru kry kub kud kue kuk kur kuu kuy kyd kye kyo kyr kyu ob- obb obd obe obk obo obr obu oby odb odd ode odo odr odu oeb oed oee oeo oer oey okb okd oke okk oko okr oku oo- oob ood ook ooo oor or- orb ord ore ork oro orr oru ory ou- oud oue ouk ouo our oyd oye oyo rbb rbd rbe rbk rbo rbr rbu rdb rdd rde rdo rdr rdu rdy re- reb red ree rek reo rer reu rey rkb rke rkk rko rku rky rob rod roe rok roo ror rou roy rrb rrd rrk rrr rru rub rud rue ruk ruo rur ruu ruy ry- ryd rye ryk ryo ryr ryu ryy ubb ube ubk ubo ubr ubu uby udb udd ude udk udo udr udu ueb ued uee uer uey ukb uke ukk ukr uku uob uod uoe uok uoo uor ur- urb urd ure urk uro urr uru ury uue uur uuu uyo uyu ybe ybr yby yde ydo ydy yeb yed yee yek yeo yer yey ykk yob yod yoe yok yoo yor you yoy yre yro yru yud yue yuk yuo yur yuu yuy yyb yye yyu yyy