-er bbb bbe bbm bbn bbr bbs be- beb bee bem ben ber bes bmb bme bmm bmn bmr bms bnb bne bnn bnr bns brb bre brm brn brr brs bsb bse bsm bsn bsr bss ebb ebe ebm ebn ebr ebs eeb eee eem een eer ees em- emb eme emm emn emr ems en- enb ene enm enn enr ens erb ere erm ern err ers es- esb ese esm esn esr ess m-r mbb mbe mbm mbr mbs meb mee mem men mer mes mmb mme mmm mmn mmr mms mnb mne mnm mnn mnr mns mrb mre mrm mrn mrr mrs msb mse msm msn msr mss nbb nbe nbm nbn nbr nbs ne- neb nee nem nen ner nes nmb nme nmm nmn nmr nms nnb nne nnm nnn nns nrb nre nrm nrn nrr nrs nsb nse nsm nsn nsr nss rbb rbe rbm rbn rbr rbs re- reb ree rem ren rer res rmb rme rmm rmn rmr rms rnb rnm rnn rnr rns rrb rrm rrn rrr rrs rsb rse rsm rsn rsr rss sbb sbe sbm sbn sbr sbs se- seb see sem sen ser ses smb sme smm smn smr sms snb sne snm snn snr sns sr- srb sre srm srn srr srs ss- ssb sse ssm ssn ssr sss