-er bbb bbe bbi bbk bbn bbr bbs bbt be- beb bee bei bek ben ber bes bet bi- bib bie bii bik bin bir bis bit bkb bke bkk bkn bkr bks bkt bnb bne bni bnk bnn bnr bns bnt brb bre bri brk brn brr brs brt bsb bse bsi bsk bsn bsr bss bst btb bte bti btk btn btr bts btt ebb ebe ebi ebk ebn ebr ebs ebt eeb eee eek een eer ees eet eib eie eii eik ein eir eis eit ekb eke eki ekr eks ekt en- enb ene eni enk enn enr ens ent erb ere eri erk ern err ers ert es- esb ese esi esk esn esr ess est etb ete eti etk etn etr ets ett ibb ibe ibi ibk ibn ibr ibs ibt ie- iee iei iek ien ier ies iet iib iie iii iin iir iis iit ikb ike iki ikk ikr iks ikt in- inb ine ini ink inn inr ins int ir- irb ire iri irk irn irr irs irt is- isb ise isi isk isn isr iss ist itb ite iti itk itn its itt k-t kbb kbe kbi kbk kbn kbr kbs ke- keb kee kei kek ken ker kes ket kib kie kii kik kin kir kis kit kkb kke kki kkk kkn kkr kks kkt kn- kne kni knk knn knr knt kri krk krn krr krs krt ksb kse ksi ksk ksn ksr kss kst ktb kte ktk ktn ktr kts ktt n-i nbb nbe nbi nbk nbn nbr nbs nbt ne- neb nee nei nek nen ner nes net nib nie nii nik nin nir nis nit nke nki nkk nkn nkr nks nkt nnb nne nni nnk nnn nns nnt nrb nre nri nrk nrn nrr nrs nrt nsb nse nsi nsk nsn nsr nss nst ntb nte nti ntk ntn ntr nts ntt rbb rbe rbi rbk rbn rbr rbs rbt re- reb ree rei rek ren rer res ret rib rie rii rik rin rir ris rit rkb rke rkk rks rkt rnb rni rnn rnr rns rnt rrb rri rrk rrn rrr rrs rrt rsb rse rsi rsk rsn rsr rss rst rtb rte rti rtk rtn rtr rts rtt sbb sbe sbi sbk sbn sbr sbs sbt se- seb see sei sek sen ser ses set sib sie sii sik sin sir sis sit sk- skb ske ski skk skr sks skt snb sne sni snk snn snr sns snt sr- srb sre sri srk srn srr srs srt ss- ssb sse ssi ssk ssn ssr sss sst stb ste sti stk stn str sts stt tbb tbe tbi tbk tbn tbr tbs tbt te- teb tee tei tek ten ter tes tet tib tie tii tik tin tir tis tit tkb tke tkk tkr tks tkt tnb tne tni tnk tnn tnr tns tnt trb tre tri trk trn trr trs trt tsb tse tsi tsk tsn tsr tss tst ttb tte tti ttk ttn ttr tts ttt