-er -ol b-p bbb bbe bbl bbo bbp bbr bbs bbt be- beb bee bel beo bep ber bes bet blb ble bll blo blp blr bls blt bob boe bol boo bop bor bos bot bpb bpe bpl bpo bpp bpr bps bpt brb bre brl bro brp brr brs brt bsb bse bsl bso bsp bsr bss bst btb bte btl bto btp btr bts btt ebb ebe ebl ebo ebp ebr ebs ebt eeb eee eel eeo eep eer ees eet elb ele ell elo elp elr els elt eo- eob eoe eol eoo eop eor eos eot ep- epb epe epl epo epp epr eps ept erb ere erl ero erp err ers ert es- esb ese esl eso esp esr ess est etb ete etl eto etp etr ets ett l-p lbb lbe lbl lbo lbp lbr lbs lbt leb lee lel leo lep ler les let llb lle lll llo llp llr lls llt lob loe lol loo lop lor los lot lpb lpe lpl lpo lpp lpr lps lpt lrb lro lrp lrr lrs lrt lsb lse lsl lso lsp lsr lss lst ltb lte ltl lto ltp ltr lts ltt ob- obb obe obl obo obp obr obs obt oeb oee oel oeo oep oer oes oet olb ole oll olo olp ols olt oo- oob ool ooo oop oor oos oot op- opb ope opl opo opp opr ops opt or- orb ore orl oro orp orr ors ort os- osb ose osl oso osp osr oss ost ot- otb ote otl oto otp otr ots ott p-p pbb pbe pbl pbo pbp pbr pbs pbt peb pee pel peo pep per pes pet plb ple pll plo plp plr pls plt pob poe pol poo pop por pos pot ppb ppe ppl ppo ppp ppr pps ppt prb pre prl pro prp prr prs prt ps- psb pse psl pso psp psr pss pst pt- ptb pte ptl pto ptp ptr pts ptt rbb rbe rbl rbo rbp rbr rbs rbt re- reb ree rel reo rep rer res ret rle rll rlo rlp rlr rls rlt rob roe rol roo rop ror ros rot rpb rpe rpl rpo rpp rpr rps rpt rrb rrl rrp rrr rrs rrt rsb rse rsl rso rsp rsr rss rst rtb rte rtl rto rtp rtr rts rtt sbb sbe sbl sbo sbp sbr sbs sbt se- seb see sel seo sep ser ses set slb sle sll slo slp slr sls slt sob soe sol soo sop sor sos sot spb spe spl spo spp spr sps spt sr- srb sre srl sro srp srr srs srt ss- ssb sse ssl sso ssp ssr sss sst stb ste stl sto stp str sts stt tbb tbe tbl tbo tbp tbr tbs tbt te- teb tee tel teo tep ter tes tet tle tll tlo tlp tlr tls tlt to- tob toe tol too top tor tos tot tpb tpe tpl tpo tpp tpr tps tpt trb tre trl tro trp trr trs trt tsb tse tsl tso tsp tsr tss tst ttb tte ttl tto ttp ttr tts ttt