-er b-u bbb bbe bbi bbk bbl bbr bbt bbu be- beb bee bei bek bel ber bet beu bi- bib bie bii bik bil bir bit biu bkb bke bkk bkl bkr bkt blb ble bli blk bll blr blt blu brb bre bri brk brl brr brt bru btb bte bti btk btl btr btt btu bub bue bui buk bul bur but buu ebb ebe ebi ebk ebl ebr ebt ebu eeb eee eek eel eer eet eib eie eii eik eil eir eit eiu ekb eke eki ekl ekr ekt eku elb ele eli elk ell elr elt elu erb ere eri erk erl err ert eru etb ete eti etk etl etr ett etu eu- eub eue eui eul eur eut ibb ibe ibi ibk ibl ibr ibt ibu ie- iee iei iek iel ier iet iib iie iii iil iir iit iiu ikb ike iki ikk ikl ikr ikt iku il- ilb ile ili ilk ill ilr ilt ilu ir- irb ire iri irk irl irr irt iru itb ite iti itk itl itt itu iu- iub iue iui iur iut k-t kbb kbe kbi kbk kbl kbr kbu ke- keb kee kei kek kel ker ket kib kie kii kik kil kir kit kiu kkb kke kki kkk kkl kkr kkt kku kl- klb kli klr klt klu kri krk krl krr krt kru ktb kte ktk ktl ktr ktt ktu kub kue kui kuk kul kur kut kuu lbb lbe lbi lbk lbl lbr lbt lbu leb lee lei lek lel ler let leu lib lie lii lik lil lir lit liu lkb lkl lkr lkt llb lle lli llk lll llr llt llu lrb lri lrk lrr lrt lru ltb lte lti ltk ltl ltr ltt ltu lub lue lui luk lul lur lut luu rbb rbe rbi rbk rbl rbr rbt rbu re- reb ree rei rek rel rer ret reu rib rie rii rik ril rir rit rkb rke rkk rkt rku rle rli rll rlr rlt rlu rrb rri rrk rrl rrr rrt rru rtb rte rti rtk rtl rtr rtt rtu rub rue rui ruk rur rut ruu tbb tbe tbi tbk tbl tbr tbt tbu te- teb tee tei tek tel ter tet teu tib tie tii tik til tir tit tiu tkb tke tkk tkl tkr tkt tle tli tlk tll tlr tlt tlu trb tre tri trk trl trr trt tru ttb tte tti ttk ttl ttr ttt ttu tub tue tui tuk tul tur tut tuu ubb ube ubi ubk ubl ubr ubt ubu ueb uee uei uel uer uet uib uie uii uil uir uit uiu ukb uke uki ukk ukl ukr uku ulb ule uli ulk ull ulr ult ulu ur- urb ure uri urk url urr urt uru utb ute uti utk utl utr utt utu uue uur uut uuu