-er bbb bbc bbd bbe bbk bbo bbr bcb bcc bcd bce bcj bck bco bcr bdb bdc bdd bde bdj bdk bdo bdr be- beb bec bed bee bek beo ber bjc bjd bjj bjk bjr bkb bkc bke bkk bko bkr bob boc bod boe boj bok boo bor brb brd bre brj brk bro brr c-- c-j cbb cbc cbd cbe cbj cbk cbo cbr ccb ccc ccd cce ccj cck cco ccr cdb cdc cdd cde cdj cdk cdo cdr ce- ceb cec ced cee cej cek ceo cer cjb cjc cjd cjk cjr ckb ckc ckd cko co- cob coc cod coe coj cok coo cor crb crc crd cre crj crk cro crr dbb dbc dbd dbe dbk dbo dbr dcb dcc dcd dce dck dco dcr ddb ddc ddd dde ddk ddo ddr de- deb dec ded dee dej dek deo der dj- djb djc djd dje djk djo dkb dkc dke dkk dko dkr dob doc dod doe doj dok doo dor drb drc drd dre drj drk dro drr ebb ebc ebd ebe ebj ebk ebo ebr ec- ecb ecc ecd ece ecj eck eco ecr ed- edb edc edd ede edj edk edo edr eeb eec eed eee eek eeo eer ejc ejd ejo ekb ekc ekd eke eko ekr eo- eob eoc eod eoe eok eoo eor erb erc erd ere erk ero err j-d jbc jbj jbk jbo jbr jcb jcc jcd jce jck jco jcr jdb jdc jde jdo jdr jeb jec jed jee jej jek jeo jer jjb jjc jjj jjk jjr jkb jkk jko jkr job joc jod joe joj jok joo jor jrb jrc jrk jro jrr kbb kbc kbd kbe kbk kbo kbr kcb kcc kcd kce kck kcr kdb kdc kde kdk kdo kdr ke- keb kec ked kee kek keo ker kjb kjc kje kjr kkb kkc kke kkk kkr kob koc kod koe kok koo kor krc krd krk kro krr ob- obb obc obd obe obj obk obo obr oc- ocb occ ocd ocj ock oco ocr odb odc odd ode odo odr oeb oec oed oee oeo oer ojb ojc ojd oje ojo okb okc okd oke okj okk oko okr oo- oob ooc ood ook ooo oor or- orb orc ord ore ork oro orr rbb rbc rbd rbe rbk rbo rbr rcb rcc rcd rce rcj rco rcr rdb rdc rdd rde rdj rdo rdr re- reb rec red ree rek reo rer rjc rjk rjr rkb rkc rke rkk rko rob roc rod roe roj rok roo ror rrb rrc rrd rrk rrr