-er -ey bbb bbc bbe bbn bbo bbr bbs bby bcb bcc bce bcn bco bcr bcs bcy be- beb bec bee ben beo ber bes bey bnb bnc bne bnn bno bnr bns bob boc boe bon boo bor bos boy brb bre brn bro brr brs bry bsb bsc bse bsn bso bsr bss bsy by- byc bye byn byo byr bys c-- cbb cbc cbe cbn cbo cbr cbs cby ccb ccc cce ccn cco ccr ccs ce- ceb cec cee cen ceo cer ces cey cn- cnb cnc cne cnn cno cnr cns cny co- cob coc coe con coo cor cos coy crb crc cre crn cro crr crs cry csb csc cse csn cso csr css csy cyb cyc cye cyn cyo cyr cys ebb ebc ebe ebn ebo ebr ebs eby ec- ecb ecc ece ecn eco ecr ecs eeb eec eee een eeo eer ees eey en- enb enc ene enn eno enr ens eny eo- eob eoc eoe eon eoo eor eos erb erc ere ern ero err ers ery es- esb esc ese esn eso esr ess esy eyc eye eyn eyo eyr eys nbb nbc nbe nbn nbo nbr nbs ncb ncc nce ncn nco ncr ncs ne- neb nec nee nen neo ner nes ney nnb nnc nne nnn nno nns no- nob noc noe non noo nor nos noy nrb nrc nre nrn nro nrr nrs nry nsb nsc nse nsn nso nsr nss nsy nyc nye nyn nyo nys nyy ob- obb obc obe obn obo obr obs oby oc- ocb occ ocn oco ocr ocs oeb oec oee oen oeo oer oes oey on- onb onc one onn ono onr ons ony oo- oob ooc oon ooo oor oos or- orb orc ore orn oro orr ors ory os- osb osc ose osn oso osr oss oye oyo oys rbb rbc rbe rbn rbo rbr rbs rcb rcc rce rcn rco rcr rcs re- reb rec ree ren reo rer res rey rnb rnc rnn rno rnr rns rny rob roc roe ron roo ror ros roy rrb rrc rrn rrr rrs rsb rsc rse rsn rso rsr rss ry- ryc rye ryn ryo ryr rys ryy sbb sbc sbe sbn sbo sbr sbs sby scb scc sce scn sco scr scs se- seb sec see sen seo ser ses sey snb snc sne snn sno snr sns sny sob soc soe son soo sor sos soy sr- srb src sre srn sro srr srs sry ss- ssb ssc sse ssn sso ssr sss sy- syb syc sye syn syr sys ybc ybe ybr ybs yby ycc yce yco ycs ycy yeb yec yee yen yeo yer yes yey yne ynn yns yny yob yoc yoe yon yoo yor yos yoy yrc yre yrn yro yrs ysb ysc yse yso ysr yss ysy yyb yyc yye yys yyy