-er -ey bbb bbc bbd bbe bbk bbr bby bcb bcc bcd bce bck bcr bcy bdb bdc bdd bde bdk bdr bdy be- beb bec bed bee bek ber bey bkb bkc bke bkk bkr brb brd bre brk brr bry by- byc byd bye byk byr c-- cbb cbc cbd cbe cbk cbr cby ccb ccc ccd cce cck ccr cdb cdc cdd cde cdk cdr cdy ce- ceb cec ced cee cek cer cey ckb ckc ckd cky crb crc crd cre crk crr cry cyb cyc cyd cye cyk cyr dbb dbc dbd dbe dbk dbr dby dcb dcc dcd dce dck dcr ddb ddc ddd dde ddk ddr ddy de- deb dec ded dee dek der dey dkb dkc dke dkk dkr drb drc drd dre drk drr dry dy- dyb dyc dyd dye dyk dyr dyy ebb ebc ebd ebe ebk ebr eby ec- ecb ecc ecd ece eck ecr ed- edb edc edd ede edk edr edy eeb eec eed eee eek eer eey ekb ekc ekd eke ekr eky erb erc erd ere erk err ery eyc eyd eye eyr kbb kbc kbd kbe kbk kbr kcb kcc kcd kce kck kcr kdb kdc kde kdk kdr kdy ke- keb kec ked kee kek ker key kkb kkc kke kkk kkr kky krc krd krk krr kry kyc kyd kye kyr rbb rbc rbd rbe rbk rbr rcb rcc rcd rce rcr rdb rdc rdd rde rdr rdy re- reb rec red ree rek rer rey rkb rkc rke rkk rky rrb rrc rrd rrk rrr ry- ryc ryd rye ryk ryr ryy ybc ybe ybr yby ycc ycd yce ycy yde ydy yeb yec yed yee yek yer yey ykk yrc yre yyb yyc yye yyy