-er b-p bbb bbe bbi bbp bbr bbs bbt be- beb bee bei bep ber bes bet bez bi- bib bie bii bip bir bis bit biz bpb bpe bpi bpp bpr bps bpt brb bre bri brp brr brs brt brz bsb bse bsi bsp bsr bss bst btb bte bti btp btr bts btt btz bze bzp bzr bzs bzz ebb ebe ebi ebp ebr ebs ebt eeb eee eep eer ees eet eib eie eii eip eir eis eit ep- epb epe epi epp epr eps ept epz erb ere eri erp err ers ert erz es- esb ese esi esp esr ess est etb ete eti etp etr ets ett etz eze ezr ezs ezz ibb ibe ibi ibp ibr ibs ibt ibz ie- iee iei iep ier ies iet iib iie iii iip iir iis iit ipb ipe ipi ipp ipr ips ipt ir- irb ire iri irp irr irs irt is- isb ise isi isp isr iss ist itb ite iti itp its itt itz ize izi izz p-p pbb pbe pbi pbp pbr pbs pbt pbz peb pee pei pep per pes pet pez pib pie pii pip pir pis pit piz ppb ppe ppi ppp ppr pps ppt ppz prb pre pri prp prr prs prt prz ps- psb pse psi psp psr pss pst pt- ptb pte pti ptp ptr pts ptt ptz pzp pzt rbb rbe rbi rbp rbr rbs rbt re- reb ree rei rep rer res ret rez rib rie rii rip rir ris rit riz rpb rpe rpi rpp rpr rps rpt rpz rrb rri rrp rrr rrs rrt rsb rse rsi rsp rsr rss rst rtb rte rti rtp rtr rts rtt rtz rzb rze sbb sbe sbi sbp sbr sbs sbt se- seb see sei sep ser ses set sez sib sie sii sip sir sis sit spb spe spi spp spr sps spt spz sr- srb sre sri srp srr srs srt ss- ssb sse ssi ssp ssr sss sst ssz stb ste sti stp str sts stt stz sze szi szp szr tbb tbe tbi tbp tbr tbs tbt tbz te- teb tee tei tep ter tes tet tez tib tie tii tip tir tis tit tiz tpb tpe tpi tpp tpr tps tpt tpz trb tre tri trp trr trs trt trz tsb tse tsi tsp tsr tss tst ttb tte tti ttp ttr tts ttt tze tzs zbb zbr zbs zbt zeb zee zep zer zes zet zez zib zie zip zir zis zit ziz zpe zpi zpp zpr zpt zrp zrs zse zsi zst zsz zte ztr zzr zzs zzt zzz