-er b-u bbb bbd bbe bbi bbk bbl bbr bbu bdb bdd bde bdi bdk bdl bdr bdu be- beb bed bee bei bek bel ber beu bi- bib bid bie bii bik bil bir biu bkb bke bkk bkl bkr blb bld ble bli blk bll blr blu brb brd bre bri brk brl brr bru bub bud bue bui buk bul bur buu dbb dbd dbe dbi dbk dbl dbr dbu ddb ddd dde ddi ddk ddl ddr ddu de- deb ded dee dei dek del der deu di- dib did die dii dik dil dir diu dkb dke dki dkk dkl dkr dku dl- dlb dld dle dli dlk dll dlr dlu drb drd dre dri drk drl drr dru dub dud due dui duk dul dur ebb ebd ebe ebi ebk ebl ebr ebu ed- edb edd ede edi edk edl edr edu eeb eed eee eek eel eer eib eid eie eii eik eil eir eiu ekb ekd eke eki ekl ekr eku elb eld ele eli elk ell elr elu erb erd ere eri erk erl err eru eu- eub eud eue eui eul eur i-d ibb ibd ibe ibi ibk ibl ibr ibu idb idd ide idi idk idl idr idu ie- ied iee iei iek iel ier iib iid iie iii iil iir iiu ikb ike iki ikk ikl ikr iku il- ilb ild ile ili ilk ill ilr ilu ir- irb ird ire iri irk irl irr iru iu- iub iud iue iui iur kbb kbd kbe kbi kbk kbl kbr kbu kdb kde kdk kdl kdr kdu ke- keb ked kee kei kek kel ker kib kid kie kii kik kil kir kiu kkb kke kki kkk kkl kkr kku kl- klb kld kli klr klu krd kri krk krl krr kru kub kud kue kui kuk kul kur kuu lbb lbd lbe lbi lbk lbl lbr lbu ldb ldd lde ldi ldk ldl ldr ldu leb led lee lei lek lel ler leu lib lid lie lii lik lil lir liu lkb lkl lkr llb lld lle lli llk lll llr llu lrb lrd lri lrk lrr lru lub lud lue lui luk lul lur luu rbb rbd rbe rbi rbk rbl rbr rbu rdb rdd rde rdi rdl rdr rdu re- reb red ree rei rek rel rer reu rib rid rie rii rik ril rir rkb rke rkk rku rld rle rli rll rlr rlu rrb rrd rri rrk rrl rrr rru rub rud rue rui ruk rur ruu ubb ube ubi ubk ubl ubr ubu udb udd ude udi udk udl udr udu ueb ued uee uei uel uer uib uid uie uii uil uir uiu ukb uke uki ukk ukl ukr uku ulb uld ule uli ulk ull ulr ulu ur- urb urd ure uri urk url urr uru uue uur uuu