-er b-p bbb bbe bbl bbp bbr bbs bbt be- beb bee bel bep ber bes bet blb ble bll blp blr bls blt bpb bpe bpl bpp bpr bps bpt brb bre brl brp brr brs brt bsb bse bsl bsp bsr bss bst btb bte btl btp btr bts btt ebb ebe ebl ebp ebr ebs ebt eeb eee eel eep eer ees eet elb ele ell elp elr els elt ep- epb epe epl epp epr eps ept erb ere erl erp err ers ert es- esb ese esl esp esr ess est etb ete etl etp etr ets ett l-p lbb lbe lbl lbp lbr lbs lbt leb lee lel lep ler les let llb lle lll llp llr lls llt lpb lpe lpl lpp lpr lps lpt lrb lrp lrr lrs lrt lsb lse lsl lsp lsr lss lst ltb lte ltl ltp ltr lts ltt p-p pbb pbe pbl pbp pbr pbs pbt peb pee pel pep per pes pet plb ple pll plp plr pls plt ppb ppe ppl ppp ppr pps ppt prb pre prl prp prr prs prt ps- psb pse psl psp psr pss pst pt- ptb pte ptl ptp ptr pts ptt rbb rbe rbl rbp rbr rbs rbt re- reb ree rel rep rer res ret rle rll rlp rlr rls rlt rpb rpe rpl rpp rpr rps rpt rrb rrl rrp rrr rrs rrt rsb rse rsl rsp rsr rss rst rtb rte rtl rtp rtr rts rtt sbb sbe sbl sbp sbr sbs sbt se- seb see sel sep ser ses set slb sle sll slp slr sls slt spb spe spl spp spr sps spt sr- srb sre srl srp srr srs srt ss- ssb sse ssl ssp ssr sss sst stb ste stl stp str sts stt tbb tbe tbl tbp tbr tbs tbt te- teb tee tel tep ter tes tet tle tll tlp tlr tls tlt tpb tpe tpl tpp tpr tps tpt trb tre trl trp trr trs trt tsb tse tsl tsp tsr tss tst ttb tte ttl ttp ttr tts ttt