-er b-u bbb bbe bbi bbk bbl bbr bbu be- beb bee bei bek bel ber beu bi- bib bie bii bik bil bir biu bkb bke bkk bkl bkr blb ble bli blk bll blr blu brb bre bri brk brl brr bru bub bue bui buk bul bur buu ebb ebe ebi ebk ebl ebr ebu eeb eee eek eel eer eib eie eii eik eil eir eiu ekb eke eki ekl ekr eku elb ele eli elk ell elr elu erb ere eri erk erl err eru eu- eub eue eui eul eur ibb ibe ibi ibk ibl ibr ibu ie- iee iei iek iel ier iib iie iii iil iir iiu ikb ike iki ikk ikl ikr iku il- ilb ile ili ilk ill ilr ilu ir- irb ire iri irk irl irr iru iu- iub iue iui iur kbb kbe kbi kbk kbl kbr kbu ke- keb kee kei kek kel ker kib kie kii kik kil kir kiu kkb kke kki kkk kkl kkr kku kl- klb kli klr klu kri krk krl krr kru kub kue kui kuk kul kur kuu lbb lbe lbi lbk lbl lbr lbu leb lee lei lek lel ler leu lib lie lii lik lil lir liu lkb lkl lkr llb lle lli llk lll llr llu lrb lri lrk lrr lru lub lue lui luk lul lur luu rbb rbe rbi rbk rbl rbr rbu re- reb ree rei rek rel rer reu rib rie rii rik ril rir rkb rke rkk rku rle rli rll rlr rlu rrb rri rrk rrl rrr rru rub rue rui ruk rur ruu ubb ube ubi ubk ubl ubr ubu ueb uee uei uel uer uib uie uii uil uir uiu ukb uke uki ukk ukl ukr uku ulb ule uli ulk ull ulr ulu ur- urb ure uri urk url urr uru uue uur uuu