-er b-p bbb bbe bbi bbp bbr bbt be- beb bee bei bep ber bet bez bi- bib bie bii bip bir bit biz bpb bpe bpi bpp bpr bpt brb bre bri brp brr brt brz btb bte bti btp btr btt btz bze bzp bzr bzz ebb ebe ebi ebp ebr ebt eeb eee eep eer eet eib eie eii eip eir eit ep- epb epe epi epp epr ept epz erb ere eri erp err ert erz etb ete eti etp etr ett etz eze ezr ezz ibb ibe ibi ibp ibr ibt ibz ie- iee iei iep ier iet iib iie iii iip iir iit ipb ipe ipi ipp ipr ipt ir- irb ire iri irp irr irt itb ite iti itp itt itz ize izi izz p-p pbb pbe pbi pbp pbr pbt pbz peb pee pei pep per pet pez pib pie pii pip pir pit piz ppb ppe ppi ppp ppr ppt ppz prb pre pri prp prr prt prz pt- ptb pte pti ptp ptr ptt ptz pzp pzt rbb rbe rbi rbp rbr rbt re- reb ree rei rep rer ret rez rib rie rii rip rir rit riz rpb rpe rpi rpp rpr rpt rpz rrb rri rrp rrr rrt rtb rte rti rtp rtr rtt rtz rzb rze tbb tbe tbi tbp tbr tbt tbz te- teb tee tei tep ter tet tez tib tie tii tip tir tit tiz tpb tpe tpi tpp tpr tpt tpz trb tre tri trp trr trt trz ttb tte tti ttp ttr ttt tze zbb zbr zbt zeb zee zep zer zet zez zib zie zip zir zit ziz zpe zpi zpp zpr zpt zrp zte ztr zzr zzt zzz