-er b-u bbb bbe bbk bbm bbr bbu be- beb bee bek bem ber beu bez bkb bke bkk bkm bkr bmb bme bmk bmm bmr bmu bmz brb bre brk brm brr bru brz bub bue buk bum bur buu buz bze bzr bzu bzz ebb ebe ebk ebm ebr ebu eeb eee eek eem eer ekb eke ekr eku em- emb eme emk emm emr emu erb ere erk erm err eru erz eu- eub eue eur eze ezr ezz k-z kbb kbe kbk kbm kbr kbu kbz ke- keb kee kek kem ker kez kkb kke kkk kkm kkr kku kmb kme kmk kmm kmu kmz krk krr kru kub kue kuk kum kur kuu m-r mbb mbe mbk mbm mbr mbu meb mee mek mem mer meu mez mkb mke mkk mkm mkr mku mkz mmb mme mmk mmm mmr mmu mmz mrb mre mrk mrm mrr mru mrz mub mue muk mum mur muu mzb mzm rbb rbe rbk rbm rbr rbu re- reb ree rek rem rer reu rez rkb rke rkk rkm rku rkz rmb rme rmm rmr rrb rrk rrm rrr rru rub rue ruk rum rur ruu ruz rzb rze rzm ubb ube ubk ubr ubu ueb uee uem uer ukb uke ukk ukr uku ukz um- umb ume umm umr umu ur- urb ure urk urm urr uru urz uue uum uur uuu uzb uzu zbb zbm zbr zeb zee zek zem zer zez zmb zmk zmm zub zuk zum zur zuz zzr zzz