-er b-u bbb bbe bbk bbm bbn bbr bbu be- beb bee bek bem ben ber beu bkb bke bkk bkm bkn bkr bmb bme bmk bmm bmn bmr bmu bnb bne bnk bnn bnr bnu brb bre brk brm brn brr bru bub bue buk bum bun bur buu ebb ebe ebk ebm ebn ebr ebu eeb eee eek eem een eer ekb eke ekr eku em- emb eme emk emm emn emr emu en- enb ene enk enm enn enr enu erb ere erk erm ern err eru eu- eub eue eun eur kbb kbe kbk kbm kbn kbr kbu ke- keb kee kek kem ken ker kkb kke kkk kkm kkn kkr kku kmb kme kmk kmm kmu kn- kne knk knm knn knr knu krk krn krr kru kub kue kuk kum kun kur kuu m-r mbb mbe mbk mbm mbr mbu meb mee mek mem men mer meu mkb mke mkk mkm mkn mkr mku mmb mme mmk mmm mmn mmr mmu mnb mne mnk mnm mnn mnr mnu mrb mre mrk mrm mrn mrr mru mub mue muk mum mun mur muu nbb nbe nbk nbm nbn nbr nbu ne- neb nee nek nem nen ner neu nke nkk nkm nkn nkr nku nmb nme nmk nmm nmn nmr nmu nnb nne nnk nnm nnn nnu nrb nre nrk nrm nrn nrr nru nub nue nuk num nun nur nuu rbb rbe rbk rbm rbn rbr rbu re- reb ree rek rem ren rer reu rkb rke rkk rkm rku rmb rme rmm rmn rmr rnb rnm rnn rnr rnu rrb rrk rrm rrn rrr rru rub rue ruk rum run rur ruu ubb ube ubk ubn ubr ubu ueb uee uem uen uer ukb uke ukk ukn ukr uku um- umb ume umm umn umr umu un- unb une unk unm unn unr unu ur- urb ure urk urm urn urr uru uue uum uun uur uuu