-er eee eel eep eer ees eet eex ele ell elp elr els elt elx ep- epe epl epp epr eps ept epx ere erl erp err ers ert es- ese esl esp esr ess est esx ete etl etp etr ets ett etx ex- exe exl exp exr exs ext exx l-p lee lel lep ler les let lex lle lll llp llr lls llt lpe lpl lpp lpr lps lpt lpx lrp lrr lrs lrt lse lsl lsp lsr lss lst lte ltl ltp ltr lts ltt ltx lxr lxx p-p pee pel pep per pes pet pex ple pll plp plr pls plt plx ppe ppl ppp ppr pps ppt ppx pre prl prp prr prs prt prx ps- pse psl psp psr pss pst psx pt- pte ptl ptp ptr pts ptt ptx pxe pxl pxr pxs pxt re- ree rel rep rer res ret rex rle rll rlp rlr rls rlt rpe rpl rpp rpr rps rpt rpx rrl rrp rrr rrs rrt rse rsl rsp rsr rss rst rsx rte rtl rtp rtr rts rtt rtx rxp rxr rxs se- see sel sep ser ses set sex sle sll slp slr sls slt slx spe spl spp spr sps spt spx sr- sre srl srp srr srs srt srx ss- sse ssl ssp ssr sss sst ssx ste stl stp str sts stt stx sxl sxs sxt t-x te- tee tel tep ter tes tet tex tle tll tlp tlr tls tlt tlx tpe tpl tpp tpr tps tpt tpx tre trl trp trr trs trt trx tse tsl tsp tsr tss tst tsx tte ttl ttp ttr tts ttt ttx txe txl txs txt xee xel xep xer xes xet xex xlr xls xlt xpe xpl xpp xps xpt xrt xrx xsl xsp xss xst xtp xtr xts xtx xxl xxp xxx