eee eef eel eem eep ees eet ef- efe eff efl efm efp efs eft ele elf ell elm elp els elt em- eme emf eml emm emp ems emt ep- epe epf epl epm epp eps ept es- ese esf esl esm esp ess est ete etf etl etm etp ets ett fee fef fel fem fep fes fet ffe fff ffl ffm ffp ffs fft fle flf fll flm flp fls flt fme fmf fml fmm fmp fms fmt fpe fpl fpm fpp fps fpt fse fsf fsl fsm fsp fss fst fte ftf ftl ftm ftp fts ftt l-p lee lef lel lem lep les let lfe lff lfl lfm lfp lfs lft lle llf lll llm llp lls llt lme lmf lml lmm lmp lms lmt lpe lpf lpl lpm lpp lps lpt lse lsf lsl lsm lsp lss lst lte ltf ltl ltm ltp lts ltt m-f mee mef mel mem mep mes met mfe mff mfl mfm mfp mfs mft mle mlf mll mlm mlp mls mlt mme mmf mml mmm mmp mms mmt mpe mpf mpl mpm mpp mps mpt mse msf msl msm msp mss mst mte mtf mtl mtm mtp mts mtt p-p pee pef pel pem pep pes pet pfe pff pfl pfm pfp pfs pft ple plf pll plm plp pls plt pme pmf pml pmm pmp pms pmt ppe ppf ppl ppm ppp pps ppt ps- pse psf psl psm psp pss pst pt- pte ptf ptl ptm ptp pts ptt se- see sef sel sem sep ses set sfe sff sfl sfm sfp sfs sft sle slf sll slm slp sls slt sme smf sml smm smp sms smt spe spf spl spm spp sps spt ss- sse ssf ssl ssm ssp sss sst ste stf stl stm stp sts stt te- tee tef tel tem tep tes tet tfe tff tfl tfm tfp tfs tft tle tlf tll tlm tlp tls tlt tme tmf tml tmm tmp tms tmt tpe tpf tpl tpm tpp tps tpt tse tsf tsl tsm tsp tss tst tte ttf ttl ttm ttp tts ttt