-er -ol bbb bbe bbi bbk bbl bbn bbo bbr be- beb bee bei bek bel ben beo ber bi- bib bie bii bik bil bin bio bir bkb bke bkk bkl bkn bko bkr blb ble bli blk bll bln blo blr bnb bne bni bnk bnl bnn bno bnr bob boe boi bok bol bon boo bor brb bre bri brk brl brn bro brr ebb ebe ebi ebk ebl ebn ebo ebr eeb eee eek eel een eeo eer eib eie eii eik eil ein eio eir ekb eke eki ekl eko ekr elb ele eli elk ell eln elo elr en- enb ene eni enk enl enn eno enr eo- eob eoe eoi eok eol eon eoo eor erb ere eri erk erl ern ero err ibb ibe ibi ibk ibl ibn ibo ibr ie- iee iei iek iel ien ier iib iie iii iil iin iio iir ikb ike iki ikk ikl iko ikr il- ilb ile ili ilk ill iln ilo ilr in- inb ine ini ink inl inn ino inr io- iob ioe ioi iol ion ioo ior ir- irb ire iri irk irl irn iro irr kbb kbe kbi kbk kbl kbn kbo kbr ke- keb kee kei kek kel ken keo ker kib kie kii kik kil kin kio kir kkb kke kki kkk kkl kkn kkr kl- klb kli klo klr kn- kne kni knk knl knn kno knr kob koe koi kok kol kon koo kor kri krk krl krn kro krr lbb lbe lbi lbk lbl lbo lbr leb lee lei lek lel len leo ler lib lie lii lik lil lin lio lir lkb lkl lkr llb lle lli llk lll lln llo llr lnb lne lni lnk lnl lnn lno lnr lob loe loi lok lol lon loo lor lrb lri lrk lrn lro lrr n-i nbb nbe nbi nbk nbl nbn nbo nbr ne- neb nee nei nek nel nen neo ner nib nie nii nik nil nin nio nir nke nki nkk nkn nko nkr nlb nle nli nlk nll nln nlo nlr nnb nne nni nnk nnl nnn nno no- nob noe noi nok nol non noo nor nrb nre nri nrk nrl nrn nro nrr o-i ob- obb obe obi obk obl obn obo obr oeb oee oei oel oen oeo oer oib oie oii oik oil oin oio oir okb oke oki okk okl oko okr olb ole oli olk oll oln olo on- onb one oni onk onl onn ono onr oo- oob ooi ook ool oon ooo oor or- orb ore ori ork orl orn oro orr rbb rbe rbi rbk rbl rbn rbo rbr re- reb ree rei rek rel ren reo rer rib rie rii rik ril rin rio rir rkb rke rkk rko rle rli rll rln rlo rlr rnb rni rnn rno rnr rob roe roi rok rol ron roo ror rrb rri rrk rrl rrn rrr