-er -ol bbb bbc bbe bbl bbm bbo bbr bbs bcb bcc bce bcl bcm bco bcr bcs be- beb bec bee bel bem beo ber bes blb blc ble bll blm blo blr bls bmb bmc bme bml bmm bmo bmr bms bob boc boe bol bom boo bor bos brb bre brl brm bro brr brs bsb bsc bse bsl bsm bso bsr bss c-- cbb cbc cbe cbl cbm cbo cbr cbs ccb ccc cce ccl ccm cco ccr ccs ce- ceb cec cee cel cem ceo cer ces cl- clb clc cle cll clm clo clr cls cmb cmc cme cml cmm cmo cmr cms co- cob coc coe col com coo cor cos crb crc cre crl crm cro crr crs csb csc cse csl csm cso csr css ebb ebc ebe ebl ebm ebo ebr ebs ec- ecb ecc ece ecl ecm eco ecr ecs eeb eec eee eel eem eeo eer ees elb elc ele ell elm elo elr els em- emb emc eme eml emm emo emr ems eo- eob eoc eoe eol eom eoo eor eos erb erc ere erl erm ero err ers es- esb esc ese esl esm eso esr ess lbb lbc lbe lbl lbm lbo lbr lbs lcb lcc lce lcl lcm lco lcr lcs leb lec lee lel lem leo ler les llb llc lle lll llm llo llr lls lmb lmc lme lml lmm lmo lmr lms lob loc loe lol lom loo lor los lrb lrc lrm lro lrr lrs lsb lsc lse lsl lsm lso lsr lss m-o m-r mbb mbc mbe mbl mbm mbo mbr mbs mc- mcb mcc mce mcl mcm mco mcr mcs meb mec mee mel mem meo mer mes mlb mlc mle mll mlm mlo mlr mls mmb mmc mme mml mmm mmo mmr mms mob moc moe mol mom moo mor mos mrb mrc mre mrl mrm mro mrr mrs msb msc mse msl msm mso msr mss ob- obb obc obe obl obm obo obr obs oc- ocb occ ocl ocm oco ocr ocs oeb oec oee oel oem oeo oer oes olb olc ole oll olm olo ols om- omb omc ome oml omm omo omr oms oo- oob ooc ool oom ooo oor oos or- orb orc ore orl orm oro orr ors os- osb osc ose osl osm oso osr oss rbb rbc rbe rbl rbm rbo rbr rbs rcb rcc rce rcl rcm rco rcr rcs re- reb rec ree rel rem reo rer res rlc rle rll rlm rlo rlr rls rmb rmc rme rml rmm rmo rmr rms rob roc roe rol rom roo ror ros rrb rrc rrl rrm rrr rrs rsb rsc rse rsl rsm rso rsr rss sbb sbc sbe sbl sbm sbo sbr sbs scb scc sce scl scm sco scr scs se- seb sec see sel sem seo ser ses slb slc sle sll slm slo slr sls smb smc sme sml smm smo smr sms sob soc soe sol som soo sor sos sr- srb src sre srl srm sro srr srs ss- ssb ssc sse ssl ssm sso ssr sss