-er -ey bbb bbc bbe bbg bbk bbr bbs bby bcb bcc bce bcg bck bcr bcs bcy be- beb bec bee beg bek ber bes bey bgb bgc bge bgg bgk bgr bgs bkb bkc bke bkg bkk bkr bks brb bre brg brk brr brs bry bsb bsc bse bsg bsk bsr bss bsy by- byc bye byg byk byr bys c-- cbb cbc cbe cbg cbk cbr cbs cby ccb ccc cce ccg cck ccr ccs ce- ceb cec cee ceg cek cer ces cey cgb cgc cge cgg cgr cgs cgy ckb ckc cks cky crb crc cre crg crk crr crs cry csb csc cse csg csk csr css csy cyb cyc cye cyg cyk cyr cys ebb ebc ebe ebg ebk ebr ebs eby ec- ecb ecc ece ecg eck ecr ecs eeb eec eee eeg eek eer ees eey egb egc ege egg egr egs egy ekb ekc eke ekg ekr eks eky erb erc ere erg erk err ers ery es- esb esc ese esg esk esr ess esy eyc eye eyr eys gbc gbe gbg gbk gbr gbs gby gcb gcc gce gcg gck gcr gcs ge- geb gec gee geg gek ger ges gey ggb ggc ggg ggr ggs gkb gks grb grc gre grg grk grr grs gry gsb gsc gse gsg gsk gsr gss gy- gyb gye gyr gys kbb kbc kbe kbk kbr kbs kcb kcc kce kcg kck kcr kcs ke- keb kec kee keg kek ker kes key kgb kgc kgs kgy kkb kkc kke kkk kkr kks kky krc krg krk krr krs kry ksb ksc kse ksg ksk ksr kss kyc kye kyr kys rbb rbc rbe rbg rbk rbr rbs rcb rcc rce rcg rcr rcs re- reb rec ree reg rek rer res rey rgb rgc rge rgg rgk rgr rgs rkb rkc rke rkg rkk rks rky rrb rrc rrg rrk rrr rrs rsb rsc rse rsg rsk rsr rss ry- ryc rye ryg ryk ryr rys ryy sbb sbc sbe sbg sbk sbr sbs sby scb scc sce scg sck scr scs se- seb sec see seg sek ser ses sey sgb sgc sge sgg sgk sgr sgs sk- skb skc ske skg skk skr sks sky sr- srb src sre srg srk srr srs sry ss- ssb ssc sse ssg ssk ssr sss sy- syb syc sye syg syk syr sys ybc ybe ybg ybr ybs yby ycc yce ycs ycy yeb yec yee yeg yek yer yes yey ygc ykk yrc yre yrg yrs ysb ysc yse ysg ysk ysr yss ysy yyb yyc yye yyg yys yyy