-er b-u bbb bbe bbi bbk bbr bbu be- beb bee bei bek ber beu bi- bib bie bii bik bir biu bkb bke bkk bkr brb bre bri brk brr bru bub bue bui buk bur buu ebb ebe ebi ebk ebr ebu eeb eee eek eer eib eie eii eik eir eiu ekb eke eki ekr eku erb ere eri erk err eru eu- eub eue eui eur ibb ibe ibi ibk ibr ibu ie- iee iei iek ier iib iie iii iir iiu ikb ike iki ikk ikr iku ir- irb ire iri irk irr iru iu- iub iue iui iur kbb kbe kbi kbk kbr kbu ke- keb kee kei kek ker kib kie kii kik kir kiu kkb kke kki kkk kkr kku kri krk krr kru kub kue kui kuk kur kuu rbb rbe rbi rbk rbr rbu re- reb ree rei rek rer reu rib rie rii rik rir rkb rke rkk rku rrb rri rrk rrr rru rub rue rui ruk rur ruu ubb ube ubi ubk ubr ubu ueb uee uei uer uib uie uii uir uiu ukb uke uki ukk ukr uku ur- urb ure uri urk urr uru uue uur uuu