-er bbb bbc bbe bbl bbm bbn bbr bbs bcb bcc bce bcl bcm bcn bcr bcs be- beb bec bee bel bem ben ber bes blb blc ble bll blm bln blr bls bmb bmc bme bml bmm bmn bmr bms bnb bnc bne bnl bnn bnr bns brb bre brl brm brn brr brs bsb bsc bse bsl bsm bsn bsr bss c-- cbb cbc cbe cbl cbm cbn cbr cbs ccb ccc cce ccl ccm ccn ccr ccs ce- ceb cec cee cel cem cen cer ces cl- clb clc cle cll clm cln clr cls cmb cmc cme cml cmm cmn cmr cms cn- cnb cnc cne cnl cnm cnn cnr cns crb crc cre crl crm crn crr crs csb csc cse csl csm csn csr css ebb ebc ebe ebl ebm ebn ebr ebs ec- ecb ecc ece ecl ecm ecn ecr ecs eeb eec eee eel eem een eer ees elb elc ele ell elm eln elr els em- emb emc eme eml emm emn emr ems en- enb enc ene enl enm enn enr ens erb erc ere erl erm ern err ers es- esb esc ese esl esm esn esr ess lbb lbc lbe lbl lbm lbr lbs lcb lcc lce lcl lcm lcn lcr lcs leb lec lee lel lem len ler les llb llc lle lll llm lln llr lls lmb lmc lme lml lmm lmn lmr lms lnb lnc lne lnl lnm lnn lnr lns lrb lrc lrm lrn lrr lrs lsb lsc lse lsl lsm lsn lsr lss m-r mbb mbc mbe mbl mbm mbr mbs mc- mcb mcc mce mcl mcm mcn mcr mcs meb mec mee mel mem men mer mes mlb mlc mle mll mlm mln mlr mls mmb mmc mme mml mmm mmn mmr mms mnb mnc mne mnl mnm mnn mnr mns mrb mrc mre mrl mrm mrn mrr mrs msb msc mse msl msm msn msr mss nbb nbc nbe nbl nbm nbn nbr nbs ncb ncc nce ncl ncm ncn ncr ncs ne- neb nec nee nel nem nen ner nes nlb nlc nle nll nlm nln nlr nls nmb nmc nme nml nmm nmn nmr nms nnb nnc nne nnl nnm nnn nns nrb nrc nre nrl nrm nrn nrr nrs nsb nsc nse nsl nsm nsn nsr nss rbb rbc rbe rbl rbm rbn rbr rbs rcb rcc rce rcl rcm rcn rcr rcs re- reb rec ree rel rem ren rer res rlc rle rll rlm rln rlr rls rmb rmc rme rml rmm rmn rmr rms rnb rnc rnm rnn rnr rns rrb rrc rrl rrm rrn rrr rrs rsb rsc rse rsl rsm rsn rsr rss sbb sbc sbe sbl sbm sbn sbr sbs scb scc sce scl scm scn scr scs se- seb sec see sel sem sen ser ses slb slc sle sll slm sln slr sls smb smc sme sml smm smn smr sms snb snc sne snl snm snn snr sns sr- srb src sre srl srm srn srr srs ss- ssb ssc sse ssl ssm ssn ssr sss