-er -ji b-u bbb bbe bbi bbk bbo bbr bbu be- beb bee bei bek beo ber beu bi- bib bie bii bij bik bio bir biu bji bjj bjk bjr bju bkb bke bkk bko bkr bob boe boi boj bok boo bor bou brb bre bri brj brk bro brr bru bub bue bui buj buk buo bur buu ebb ebe ebi ebj ebk ebo ebr ebu eeb eee eek eeo eer eib eie eii eij eik eio eir eiu eji ejo eju ekb eke eki eko ekr eku eo- eob eoe eoi eok eoo eor eou erb ere eri erk ero err eru eu- eub eue eui euj eur ibb ibe ibi ibj ibk ibo ibr ibu ie- iee iei iej iek ier iib iie iii iij iio iir iiu ijb ije iji ijk ijo iju ikb ike iki ikk iko ikr iku io- iob ioe ioi ioj ioo ior iou ir- irb ire iri irj irk iro irr iru iu- iub iue iui iur j-i jbi jbj jbk jbo jbr jbu jeb jee jei jej jek jeo jer jeu jib jie jii jij jio jir jiu jjb jjj jjk jjr jju jkb jkk jko jkr jku job joe joi joj jok joo jor jou jrb jri jrk jro jrr jub jue jui juk juo jur kbb kbe kbi kbk kbo kbr kbu ke- keb kee kei kek keo ker kib kie kii kij kik kio kir kiu kjb kje kji kjr kju kkb kke kki kkk kkr kku kob koe koi kok koo kor kou kri krk kro krr kru kub kue kui kuj kuk kur kuu o-i ob- obb obe obi obj obk obo obr obu oeb oee oei oeo oer oib oie oii oik oio oir oiu ojb oje oji ojo oju okb oke oki okj okk oko okr oku oo- oob ooi ook ooo oor or- orb ore ori ork oro orr oru ou- oue oui ouk ouo our rbb rbe rbi rbk rbo rbr rbu re- reb ree rei rek reo rer reu rib rie rii rik rio rir rjk rjr rkb rke rkk rko rku rob roe roi roj rok roo ror rou rrb rri rrk rrr rru rub rue rui ruk ruo rur ruu ubb ube ubi ubk ubo ubr ubu ueb uee uei uer uib uie uii uio uir uiu uji ujo ukb uke uki ukk ukr uku uob uoe uoj uok uoo uor ur- urb ure uri urk uro urr uru uue uur uuu