eee eef eel eem eep ef- efe eff efi efl efm efp eie eif eii eil eim eip ele elf eli ell elm elp em- eme emf emi eml emm emp ep- epe epf epi epl epm epp fee fef fei fel fem fep ffe fff ffi ffl ffm ffp fie fif fii fil fim fip fle flf fli fll flm flp fme fmf fmi fml fmm fmp fpe fpi fpl fpm fpp i-f ie- iee ief iei iel iem iep ife iff ifi ifl ifm ifp iie iif iii iil iim iip il- ile ilf ili ill ilm ilp im- ime imf imi iml imm imp ipe ipf ipi ipl ipm ipp l-p lee lef lei lel lem lep lfe lff lfi lfl lfm lfp lie lif lii lil lim lip lle llf lli lll llm llp lme lmf lmi lml lmm lmp lpe lpf lpi lpl lpm lpp m-f mee mef mei mel mem mep mfe mff mfi mfl mfm mfp mi- mie mif mii mil mim mip mle mlf mli mll mlm mlp mme mmf mmi mml mmm mmp mpe mpf mpi mpl mpm mpp p-p pee pef pei pel pem pep pfe pff pfi pfl pfm pfp pie pif pii pil pim pip ple plf pli pll plm plp pme pmf pmi pml pmm pmp ppe ppf ppi ppl ppm ppp