-er bbb bbe bbf bbm bbn bbr be- beb bee bef bem ben ber bfb bfe bff bfm bfn bfr bmb bme bmf bmm bmn bmr bnb bne bnf bnn bnr brb bre brf brm brn brr ebb ebe ebf ebm ebn ebr eeb eee eef eem een eer ef- efb efe eff efm efr em- emb eme emf emm emn emr en- enb ene enf enm enn enr erb ere erf erm ern err fbb fbe fbf fbm fbn fbr feb fee fef fem fen fer ffe fff ffm ffn ffr fmb fme fmf fmm fmn fmr fnb fne fnf fnm fnn fnr frb fre frf frm frn frr m-f m-r mbb mbe mbf mbm mbr meb mee mef mem men mer mfb mfe mff mfm mfn mfr mmb mme mmf mmm mmn mmr mnb mne mnf mnm mnn mnr mrb mre mrf mrm mrn mrr nbb nbe nbf nbm nbn nbr ne- neb nee nef nem nen ner nfb nfe nff nfn nfr nmb nme nmm nmn nmr nnb nne nnf nnm nnn nrb nre nrf nrm nrn nrr rbb rbe rbf rbm rbn rbr re- reb ree ref rem ren rer rfb rfe rff rfm rfn rfr rmb rme rmf rmm rmn rmr rnb rnm rnn rnr rrb rrf rrm rrn rrr