-er -ol eee eef eel eeo eep eer eet eex ef- efe eff efl efo efp efr eft efx ele elf ell elo elp elr elt elx eo- eoe eof eol eoo eop eor eot ep- epe epf epl epo epp epr ept epx ere erf erl ero erp err ert ete etf etl eto etp etr ett etx ex- exe exl exo exp exr ext exx fee fef fel feo fep fer fet fex ffe fff ffl ffo ffp ffr fft ffx fle flf fll flo flp flr flt flx foe fof fol foo fop for fot fox fpe fpl fpo fpp fpr fpt fpx fre frf frl fro frp frr frt fte ftf ftl fto ftp ftr ftt ftx fxe fxp fxr fxt fxx l-p lee lef lel leo lep ler let lex lfe lff lfl lfo lfp lfr lft lfx lle llf lll llo llp llr llt loe lof lol loo lop lor lot lox lpe lpf lpl lpo lpp lpr lpt lpx lrf lro lrp lrr lrt lte ltf ltl lto ltp ltr ltt ltx lxo lxr lxx oee oef oel oeo oep oer oet oex of- ofe off ofl ofo ofp ofr oft ofx ole olf oll olo olp olt oo- oof ool ooo oop oor oot oox op- ope opf opl opo opp opr opt opx or- ore orf orl oro orp orr ort orx ot- ote otf otl oto otp otr ott ox- oxf oxo oxt oxx p-p pee pef pel peo pep per pet pex pfe pff pfl pfo pfp pfr pft pfx ple plf pll plo plp plr plt plx poe pof pol poo pop por pot pox ppe ppf ppl ppo ppp ppr ppt ppx pre prf prl pro prp prr prt prx pt- pte ptf ptl pto ptp ptr ptt ptx pxe pxl pxr pxt re- ree ref rel reo rep rer ret rex rfe rff rfl rfo rfp rfr rft rle rlf rll rlo rlp rlr rlt roe rof rol roo rop ror rot rox rpe rpf rpl rpo rpp rpr rpt rpx rrf rrl rrp rrr rrt rte rtf rtl rto rtp rtr rtt rtx rxp rxr t-x te- tee tef tel teo tep ter tet tex tfe tff tfl tfo tfp tfr tft tfx tle tlf tll tlo tlp tlr tlt tlx to- toe tof tol too top tor tot tox tpe tpf tpl tpo tpp tpr tpt tpx tre trf trl tro trp trr trt trx tte ttf ttl tto ttp ttr ttt ttx txe txf txl txt xee xel xep xer xet xex xfe xfl xft xfx xlf xlr xlt xof xoo xop xor xot xox xpe xpf xpl xpo xpp xpt xrf xrt xrx xtf xtp xtr xtx xxl xxo xxp xxx