-er -ey a-a a-b aaa aab aae aao aar aas aay ab- aba abb abe abo abr abs aby aea aeb aee aeo aer aes aey aoa aob aoe aoo aor aos ar- ara arb are aro arr ars ary as- asa asb ase aso asr ass asy ay- aya aye ayo ayr ays baa bab bae bao bar bas bay bba bbb bbe bbo bbr bbs bby be- bea beb bee beo ber bes bey boa bob boe boo bor bos boy bra brb bre bro brr brs bry bsa bsb bse bso bsr bss bsy by- bya bye byo byr bys eaa eab eae eao ear eas eba ebb ebe ebo ebr ebs eby eea eeb eee eeo eer ees eey eo- eoa eob eoe eoo eor eos era erb ere ero err ers ery es- esa esb ese eso esr ess esy eya eye eyo eyr eys oaa oab oae oao oar oas ob- oba obb obe obo obr obs oby oea oeb oee oeo oer oes oey oo- ooa oob ooo oor oos or- ora orb ore oro orr ors ory os- osa osb ose oso osr oss oya oye oyo oys ra- raa rab rae rao rar ras ray rba rbb rbe rbo rbr rbs re- rea reb ree reo rer res rey roa rob roe roo ror ros roy rra rrb rrr rrs rsa rsb rse rso rsr rss ry- rya rye ryo ryr rys ryy saa sab sae sao sar sas say sba sbb sbe sbo sbr sbs sby se- sea seb see seo ser ses sey soa sob soe soo sor sos soy sr- sra srb sre sro srr srs sry ss- ssa ssb sse sso ssr sss sy- sya syb sye syr sys yaa yab yae yao yar yas yay ybe ybr ybs yby yea yeb yee yeo yer yes yey yob yoe yoo yor yos yoy yra yre yro yrs ysa ysb yse yso ysr yss ysy yyb yye yys yyy