-er -ey bbb bbc bbd bbe bbk bbo bbr bbs bby bcb bcc bcd bce bck bco bcr bcs bcy bdb bdc bdd bde bdk bdo bdr bds bdy be- beb bec bed bee bek beo ber bes bey bkb bkc bke bkk bko bkr bks bob boc bod boe bok boo bor bos boy brb brd bre brk bro brr brs bry bsb bsc bsd bse bsk bso bsr bss bsy by- byc byd bye byk byo byr bys c-- cbb cbc cbd cbe cbk cbo cbr cbs cby ccb ccc ccd cce cck cco ccr ccs cdb cdc cdd cde cdk cdo cdr cds cdy ce- ceb cec ced cee cek ceo cer ces cey ckb ckc ckd cko cks cky co- cob coc cod coe cok coo cor cos coy crb crc crd cre crk cro crr crs cry csb csc csd cse csk cso csr css csy cyb cyc cyd cye cyk cyo cyr cys dbb dbc dbd dbe dbk dbo dbr dbs dby dcb dcc dcd dce dck dco dcr dcs ddb ddc ddd dde ddk ddo ddr dds ddy de- deb dec ded dee dek deo der des dey dkb dkc dke dkk dko dkr dks dob doc dod doe dok doo dor dos doy drb drc drd dre drk dro drr drs dry dsb dsc dsd dse dsk dso dsr dss dsy dy- dyb dyc dyd dye dyk dyo dyr dys dyy ebb ebc ebd ebe ebk ebo ebr ebs eby ec- ecb ecc ecd ece eck eco ecr ecs ed- edb edc edd ede edk edo edr eds edy eeb eec eed eee eek eeo eer ees eey ekb ekc ekd eke eko ekr eks eky eo- eob eoc eod eoe eok eoo eor eos erb erc erd ere erk ero err ers ery es- esb esc esd ese esk eso esr ess esy eyc eyd eye eyo eyr eys kbb kbc kbd kbe kbk kbo kbr kbs kcb kcc kcd kce kck kcr kcs kdb kdc kde kdk kdo kdr kds kdy ke- keb kec ked kee kek keo ker kes key kkb kkc kke kkk kkr kks kky kob koc kod koe kok koo kor kos koy krc krd krk kro krr krs kry ksb ksc ksd kse ksk kso ksr kss kyc kyd kye kyo kyr kys ob- obb obc obd obe obk obo obr obs oby oc- ocb occ ocd ock oco ocr ocs odb odc odd ode odo odr ods oeb oec oed oee oeo oer oes oey okb okc okd oke okk oko okr oks oo- oob ooc ood ook ooo oor oos or- orb orc ord ore ork oro orr ors ory os- osb osc osd ose osk oso osr oss oyd oye oyo oys rbb rbc rbd rbe rbk rbo rbr rbs rcb rcc rcd rce rco rcr rcs rdb rdc rdd rde rdo rdr rds rdy re- reb rec red ree rek reo rer res rey rkb rkc rke rkk rko rks rky rob roc rod roe rok roo ror ros roy rrb rrc rrd rrk rrr rrs rsb rsc rsd rse rsk rso rsr rss ry- ryc ryd rye ryk ryo ryr rys ryy sbb sbc sbd sbe sbk sbo sbr sbs sby scb scc scd sce sck sco scr scs sdb sdc sdd sde sdk sdo sdr sds sdy se- seb sec sed see sek seo ser ses sey sk- skb skc skd ske skk sko skr sks sky sob soc sod soe sok soo sor sos soy sr- srb src srd sre srk sro srr srs sry ss- ssb ssc ssd sse ssk sso ssr sss sy- syb syc syd sye syk syr sys ybc ybe ybr ybs yby ycc ycd yce yco ycs ycy yde ydo yds ydy yeb yec yed yee yek yeo yer yes yey ykk yob yoc yod yoe yok yoo yor yos yoy yrc yre yro yrs ysb ysc yse ysk yso ysr yss ysy yyb yyc yye yys yyy