-er bbb bbe bbi bbk bbr bbs bbt be- beb bee bei bek ber bes bet bez bi- bib bie bii bik bir bis bit biz bkb bke bkk bkr bks bkt brb bre bri brk brr brs brt brz bsb bse bsi bsk bsr bss bst btb bte bti btk btr bts btt btz bze bzr bzs bzz 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 erz es- esb ese esi esk esr ess est etb ete eti etk etr ets ett etz eze ezr ezs ezz ibb ibe ibi ibk ibr ibs ibt ibz 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 itz ize izi izz k-t k-z kbb kbe kbi kbk kbr kbs kbz ke- keb kee kei kek ker kes ket kez kib kie kii kik kir kis kit kiz 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 rez rib rie rii rik rir ris rit riz rkb rke rkk rks rkt rkz rrb rri rrk rrr rrs rrt rsb rse rsi rsk rsr rss rst rtb rte rti rtk rtr rts rtt rtz rzb rze sbb sbe sbi sbk sbr sbs sbt se- seb see sei sek ser ses set sez 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 ssz stb ste sti stk str sts stt stz sze szi szr tbb tbe tbi tbk tbr tbs tbt tbz te- teb tee tei tek ter tes tet tez tib tie tii tik tir tis tit tiz tkb tke tkk tkr tks tkt tkz trb tre tri trk trr trs trt trz tsb tse tsi tsk tsr tss tst ttb tte tti ttk ttr tts ttt tze tzs zbb zbr zbs zbt zeb zee zek zer zes zet zez zib zie zik zir zis zit ziz zks zrs zse zsi zst zsz zte ztr zzr zzs zzt zzz