-er bbb bbe bbm bbn bbr be- beb bee bem ben ber bmb bme bmm bmn bmr bnb bne bnn bnr brb bre brm brn brr ebb ebe ebm ebn ebr eeb eee eem een eer em- emb eme emm emn emr en- enb ene enm enn enr erb ere erm ern err m-r mbb mbe mbm mbr meb mee mem men mer mmb mme mmm mmn mmr mnb mne mnm mnn mnr mrb mre mrm mrn mrr nbb nbe nbm nbn nbr ne- neb nee nem nen ner nmb nme nmm nmn nmr nnb nne nnm nnn nrb nre nrm nrn nrr rbb rbe rbm rbn rbr re- reb ree rem ren rer rmb rme rmm rmn rmr rnb rnm rnn rnr rrb rrm rrn rrr