-er bbb bbe bbi bbk bbr bbs bbt be- beb bee bei bek ber bes bet bi- bib bie bii bik bir bis bit bkb bke bkk bkr bks bkt brb bre bri brk brr brs brt bsb bse bsi bsk bsr bss bst btb bte bti btk btr bts btt ebb ebe ebi ebk ebr ebs ebt eeb eee eek eer ees eet eib eie eii eik eir eis eit ekb eke eki ekr eks ekt erb ere eri erk err ers ert es- esb ese esi esk esr ess est etb ete eti etk etr ets ett ibb ibe ibi ibk ibr ibs ibt ie- iee iei iek ier ies iet iib iie iii iir iis iit ikb ike iki ikk ikr iks ikt ir- irb ire iri irk irr irs irt is- isb ise isi isk isr iss ist itb ite iti itk its itt k-t kbb kbe kbi kbk kbr kbs ke- keb kee kei kek ker kes ket kib kie kii kik kir kis kit kkb kke kki kkk kkr kks kkt kri krk krr krs krt ksb kse ksi ksk ksr kss kst ktb kte ktk ktr kts ktt rbb rbe rbi rbk rbr rbs rbt re- reb ree rei rek rer res ret rib rie rii rik rir ris rit rkb rke rkk rks rkt rrb rri rrk rrr rrs rrt rsb rse rsi rsk rsr rss rst rtb rte rti rtk rtr rts rtt sbb sbe sbi sbk sbr sbs sbt se- seb see sei sek ser ses set sib sie sii sik sir sis sit sk- skb ske ski skk skr sks skt sr- srb sre sri srk srr srs srt ss- ssb sse ssi ssk ssr sss sst stb ste sti stk str sts stt tbb tbe tbi tbk tbr tbs tbt te- teb tee tei tek ter tes tet tib tie tii tik tir tis tit tkb tke tkk tkr tks tkt trb tre tri trk trr trs trt tsb tse tsi tsk tsr tss tst ttb tte tti ttk ttr tts ttt