-er -ey bbb bbc bbd bbe bbk bbr bbs bby bcb bcc bcd bce bck bcr bcs bcy bdb bdc bdd bde bdk bdr bds bdy be- beb bec bed bee bek ber bes bey bkb bkc bke bkk bkr bks brb brd bre brk brr brs bry bsb bsc bsd bse bsk bsr bss bsy by- byc byd bye byk byr bys c-- cbb cbc cbd cbe cbk cbr cbs cby ccb ccc ccd cce cck ccr ccs cdb cdc cdd cde cdk cdr cds cdy ce- ceb cec ced cee cek cer ces cey ckb ckc ckd cks cky crb crc crd cre crk crr crs cry csb csc csd cse csk csr css csy cyb cyc cyd cye cyk cyr cys dbb dbc dbd dbe dbk dbr dbs dby dcb dcc dcd dce dck dcr dcs ddb ddc ddd dde ddk ddr dds ddy de- deb dec ded dee dek der des dey dkb dkc dke dkk dkr dks drb drc drd dre drk drr drs dry dsb dsc dsd dse dsk dsr dss dsy dy- dyb dyc dyd dye dyk dyr dys dyy ebb ebc ebd ebe ebk ebr ebs eby ec- ecb ecc ecd ece eck ecr ecs ed- edb edc edd ede edk edr eds edy eeb eec eed eee eek eer ees eey ekb ekc ekd eke ekr eks eky erb erc erd ere erk err ers ery es- esb esc esd ese esk esr ess esy eyc eyd eye eyr eys kbb kbc kbd kbe kbk kbr kbs kcb kcc kcd kce kck kcr kcs kdb kdc kde kdk kdr kds kdy ke- keb kec ked kee kek ker kes key kkb kkc kke kkk kkr kks kky krc krd krk krr krs kry ksb ksc ksd kse ksk ksr kss kyc kyd kye kyr kys rbb rbc rbd rbe rbk rbr rbs rcb rcc rcd rce rcr rcs rdb rdc rdd rde rdr rds rdy re- reb rec red ree rek rer res rey rkb rkc rke rkk rks rky rrb rrc rrd rrk rrr rrs rsb rsc rsd rse rsk rsr rss ry- ryc ryd rye ryk ryr rys ryy sbb sbc sbd sbe sbk sbr sbs sby scb scc scd sce sck scr scs sdb sdc sdd sde sdk sdr sds sdy se- seb sec sed see sek ser ses sey sk- skb skc skd ske skk skr sks sky sr- srb src srd sre srk srr srs sry ss- ssb ssc ssd sse ssk ssr sss sy- syb syc syd sye syk syr sys ybc ybe ybr ybs yby ycc ycd yce ycs ycy yde yds ydy yeb yec yed yee yek yer yes yey ykk yrc yre yrs ysb ysc yse ysk ysr yss ysy yyb yyc yye yys yyy