-er b-u bbb bbe bbg bbi bbk bbl bbr bbu be- beb bee beg bei bek bel ber beu bgb bge bgg bgi bgk bgl bgr bgu bi- bib bie big bii bik bil bir biu bkb bke bkg bkk bkl bkr blb ble blg bli blk bll blr blu brb bre brg bri brk brl brr bru bub bue bug bui buk bul bur buu ebb ebe ebg ebi ebk ebl ebr ebu eeb eee eeg eek eel eer egb ege egg egi egl egr egu eib eie eig eii eik eil eir eiu ekb eke ekg eki ekl ekr eku elb ele elg eli elk ell elr elu erb ere erg eri erk erl err eru eu- eub eue eug eui eul eur gbe gbg gbi gbk gbl gbr gbu ge- geb gee geg gei gek gel ger geu ggb ggg ggi ggr ggu gib gie gig gii gik gil gir giu gkb glb gle glg gli glk gll glr glu grb gre grg gri grk grl grr gru gu- gub gue gug gui guk gul gur guu ibb ibe ibg ibi ibk ibl ibr ibu ie- iee ieg iei iek iel ier igb ige igg igi igk igl igr igu iib iie iii iil iir iiu ikb ike iki ikk ikl ikr iku il- ilb ile ilg ili ilk ill ilr ilu ir- irb ire irg iri irk irl irr iru iu- iub iue iug iui iur kbb kbe kbi kbk kbl kbr kbu ke- keb kee keg kei kek kel ker kgb kgi kgl kgu kib kie kig kii kik kil kir kiu kkb kke kki kkk kkl kkr kku kl- klb klg kli klr klu krg kri krk krl krr kru kub kue kug kui kuk kul kur kuu lbb lbe lbg lbi lbk lbl lbr lbu leb lee leg lei lek lel ler leu lgb lge lgg lgi lgk lgl lgr lgu lib lie lig lii lik lil lir liu lkb lkg lkl lkr llb lle llg lli llk lll llr llu lrb lrg lri lrk lrr lru lub lue lug lui luk lul lur luu rbb rbe rbg rbi rbk rbl rbr rbu re- reb ree reg rei rek rel rer reu rgb rge rgg rgi rgk rgr rib rie rig rii rik ril rir rkb rke rkg rkk rku rle rlg rli rll rlr rlu rrb rrg rri rrk rrl rrr rru rub rue rug rui ruk rur ruu ubb ube ubg ubi ubk ubl ubr ubu ueb uee ueg uei uel uer ugb uge ugg ugi ugk ugl ugr ugu uib uie uig uii uil uir uiu ukb uke uki ukk ukl ukr uku ulb ule ulg uli ulk ull ulr ulu ur- urb ure urg uri urk url urr uru uue uug uur uuu