-er b-u bbb bbe bbi bbk bbn bbr bbs bbu be- beb bee bei bek ben ber bes beu bi- bib bie bii bik bin bir bis biu bkb bke bkk bkn bkr bks bnb bne bni bnk bnn bnr bns bnu brb bre bri brk brn brr brs bru bsb bse bsi bsk bsn bsr bss bsu bub bue bui buk bun bur bus buu ebb ebe ebi ebk ebn ebr ebs ebu eeb eee eek een eer ees eib eie eii eik ein eir eis eiu ekb eke eki ekr eks eku en- enb ene eni enk enn enr ens enu erb ere eri erk ern err ers eru es- esb ese esi esk esn esr ess esu eu- eub eue eui eun eur eus ibb ibe ibi ibk ibn ibr ibs ibu ie- iee iei iek ien ier ies iib iie iii iin iir iis iiu ikb ike iki ikk ikr iks iku in- inb ine ini ink inn inr ins inu ir- irb ire iri irk irn irr irs iru is- isb ise isi isk isn isr iss isu iu- iub iue iui iur ius kbb kbe kbi kbk kbn kbr kbs kbu ke- keb kee kei kek ken ker kes kib kie kii kik kin kir kis kiu kkb kke kki kkk kkn kkr kks kku kn- kne kni knk knn knr knu kri krk krn krr krs kru ksb kse ksi ksk ksn ksr kss ksu kub kue kui kuk kun kur kus kuu n-i nbb nbe nbi nbk nbn nbr nbs nbu ne- neb nee nei nek nen ner nes neu nib nie nii nik nin nir nis niu nke nki nkk nkn nkr nks nku nnb nne nni nnk nnn nns nnu nrb nre nri nrk nrn nrr nrs nru nsb nse nsi nsk nsn nsr nss nsu nub nue nui nuk nun nur nus nuu rbb rbe rbi rbk rbn rbr rbs rbu re- reb ree rei rek ren rer res reu rib rie rii rik rin rir ris rkb rke rkk rks rku rnb rni rnn rnr rns rnu rrb rri rrk rrn rrr rrs rru rsb rse rsi rsk rsn rsr rss rsu rub rue rui ruk run rur rus ruu sbb sbe sbi sbk sbn sbr sbs sbu se- seb see sei sek sen ser ses seu sib sie sii sik sin sir sis siu sk- skb ske ski skk skr sks sku snb sne sni snk snn snr sns snu sr- srb sre sri srk srn srr srs ss- ssb sse ssi ssk ssn ssr sss ssu sub sue sui suk sun sur sus suu ubb ube ubi ubk ubn ubr ubs ubu ueb uee uei uen uer ues uib uie uii uin uir uis uiu ukb uke uki ukk ukn ukr uku un- unb une uni unk unn unr uns unu ur- urb ure uri urk urn urr urs uru usb use usi usk usn usr uss usu uue uun uur uus uuu