-er -ol bbb bbc bbe bbk bbl bbm bbo bbr bcb bcc bce bck bcl bcm bco bcr be- beb bec bee bek bel bem beo ber bkb bkc bke bkk bkl bkm bko bkr blb blc ble blk bll blm blo blr bmb bmc bme bmk bml bmm bmo bmr bob boc boe bok bol bom boo bor brb bre brk brl brm bro brr c-- cbb cbc cbe cbk cbl cbm cbo cbr ccb ccc cce cck ccl ccm cco ccr ce- ceb cec cee cek cel cem ceo cer ckb ckc ckm cko cl- clb clc cle clk cll clm clo clr cmb cmc cme cmk cml cmm cmo cmr co- cob coc coe cok col com coo cor crb crc cre crk crl crm cro crr ebb ebc ebe ebk ebl ebm ebo ebr ec- ecb ecc ece eck ecl ecm eco ecr eeb eec eee eek eel eem eeo eer ekb ekc eke ekl eko ekr elb elc ele elk ell elm elo elr em- emb emc eme emk eml emm emo emr eo- eob eoc eoe eok eol eom eoo eor erb erc ere erk erl erm ero err kbb kbc kbe kbk kbl kbm kbo kbr kcb kcc kce kck kcl kcm kcr ke- keb kec kee kek kel kem keo ker kkb kkc kke kkk kkl kkm kkr kl- klb klc klm klo klr kmb kmc kme kmk kml kmm kmo kob koc koe kok kol kom koo kor krc krk krl kro krr lbb lbc lbe lbk lbl lbm lbo lbr lcb lcc lce lck lcl lcm lco lcr leb lec lee lek lel lem leo ler lkb lkl lkr llb llc lle llk lll llm llo llr lmb lmc lme lmk lml lmm lmo lmr lob loc loe lok lol lom loo lor lrb lrc lrk lrm lro lrr m-o m-r mbb mbc mbe mbk mbl mbm mbo mbr mc- mcb mcc mce mck mcl mcm mco mcr meb mec mee mek mel mem meo mer mkb mkc mke mkk mkl mkm mko mkr mlb mlc mle mlk mll mlm mlo mlr mmb mmc mme mmk mml mmm mmo mmr mob moc moe mok mol mom moo mor mrb mrc mre mrk mrl mrm mro mrr ob- obb obc obe obk obl obm obo obr oc- ocb occ ock ocl ocm oco ocr oeb oec oee oel oem oeo oer okb okc oke okk okl oko okr olb olc ole olk oll olm olo om- omb omc ome oml omm omo omr oo- oob ooc ook ool oom ooo oor or- orb orc ore ork orl orm oro orr rbb rbc rbe rbk rbl rbm rbo rbr rcb rcc rce rcl rcm rco rcr re- reb rec ree rek rel rem reo rer rkb rkc rke rkk rkm rko rlc rle rll rlm rlo rlr rmb rmc rme rml rmm rmo rmr rob roc roe rok rol rom roo ror rrb rrc rrk rrl rrm rrr