-er -ey a-a a-b aaa aab aae aak aao aar aas aay ab- aba abb abe abk abo abr abs aby aea aeb aee aek aeo aer aes aey aka akb ake akk ako akr aks aoa aob aoe aok aoo aor aos ar- ara arb are ark aro arr ars ary as- asa asb ase ask aso asr ass asy ay- aya aye ayk ayo ayr ays baa bab bae bak bao bar bas bay bba bbb bbe bbk bbo bbr bbs bby be- bea beb bee bek beo ber bes bey bka bkb bke bkk bko bkr bks boa bob boe bok boo bor bos boy bra brb bre brk bro brr brs bry bsa bsb bse bsk bso bsr bss bsy by- bya bye byk byo byr bys eaa eab eae eak eao ear eas eba ebb ebe ebk ebo ebr ebs eby eea eeb eee eek eeo eer ees eey eka ekb eke eko ekr eks eky eo- eoa eob eoe eok eoo eor eos era erb ere erk ero err ers ery es- esa esb ese esk eso esr ess esy eya eye eyo eyr eys ka- kaa kab kae kak kao kar kas kay kba kbb kbe kbk kbo kbr kbs ke- kea keb kee kek keo ker kes key kkb kke kkk kkr kks kky koa kob koe kok koo kor kos koy kra krk kro krr krs kry ksa ksb kse ksk kso ksr kss kya kye kyo kyr kys oaa oab oae oak oao oar oas ob- oba obb obe obk obo obr obs oby oea oeb oee oeo oer oes oey oka okb oke okk oko okr oks oo- ooa oob ook ooo oor oos or- ora orb ore ork oro orr ors ory os- osa osb ose osk oso osr oss oya oye oyo oys ra- raa rab rae rak rao rar ras ray rba rbb rbe rbk rbo rbr rbs re- rea reb ree rek reo rer res rey rkb rke rkk rko rks rky roa rob roe rok roo ror ros roy rra rrb rrk rrr rrs rsa rsb rse rsk rso rsr rss ry- rya rye ryk ryo ryr rys ryy saa sab sae sak sao sar sas say sba sbb sbe sbk sbo sbr sbs sby se- sea seb see sek seo ser ses sey sk- ska skb ske skk sko skr sks sky soa sob soe sok soo sor sos soy sr- sra srb sre srk sro srr srs sry ss- ssa ssb sse ssk sso ssr sss sy- sya syb sye syk syr sys yaa yab yae yak yao yar yas yay ybe ybr ybs yby yea yeb yee yek yeo yer yes yey yka ykk yob yoe yok yoo yor yos yoy yra yre yro yrs ysa ysb yse ysk yso ysr yss ysy yyb yye yys yyy