-er eee eef eel eem eep eer eex ef- efe eff efi efl efm efp efr efx eie eif eii eil eim eip eir eix ele elf eli ell elm elp elr elx em- eme emf emi eml emm emp emr emx ep- epe epf epi epl epm epp epr epx ere erf eri erl erm erp err ex- exe exi exl exp exr exx fee fef fei fel fem fep fer fex ffe fff ffi ffl ffm ffp ffr ffx fie fif fii fil fim fip fir fix fle flf fli fll flm flp flr flx fme fmf fmi fml fmm fmp fmr fmx fpe fpi fpl fpm fpp fpr fpx fre frf fri frl frm frp frr fxe fxi fxm fxp fxr fxx i-f ie- iee ief iei iel iem iep ier iex ife iff ifi ifl ifm ifp ifr ifx iie iif iii iil iim iip iir iix il- ile ilf ili ill ilm ilp ilr ilx im- ime imf imi iml imm imp imx ipe ipf ipi ipl ipm ipp ipr ipx ir- ire irf iri irl irm irp irr irx ixe ixi ixl l-p lee lef lei lel lem lep ler lex lfe lff lfi lfl lfm lfp lfr lfx lie lif lii lil lim lip lir lix lle llf lli lll llm llp llr lme lmf lmi lml lmm lmp lmr lpe lpf lpi lpl lpm lpp lpr lpx lrf lri lrm lrp lrr lxi lxr lxx m-f m-r mee mef mei mel mem mep mer mex mfe mff mfi mfl mfm mfp mfr mi- mie mif mii mil mim mip mir mix mle mlf mli mll mlm mlp mlr mlx mme mmf mmi mml mmm mmp mmr mmx mpe mpf mpi mpl mpm mpp mpr mpx mre mrf mri mrl mrm mrp mrr mrx mxi mxl mxp mxr p-p pee pef pei pel pem pep per pex pfe pff pfi pfl pfm pfp pfr pfx pie pif pii pil pim pip pir pix ple plf pli pll plm plp plr plx pme pmf pmi pml pmm pmp pmr pmx ppe ppf ppi ppl ppm ppp ppr ppx pre prf pri prl prm prp prr prx pxe pxl pxm pxr re- ree ref rei rel rem rep rer rex rfe rff rfi rfl rfm rfp rfr rie rif rii ril rim rip rir rix rle rlf rli rll rlm rlp rlr rme rmf rmi rml rmm rmp rmr rmx rpe rpf rpi rpl rpm rpp rpr rpx rrf rri rrl rrm rrp rrr rxp rxr xee xel xem xep xer xex xfe xfl xfm xfx xie xii xix xlf xli xlm xlr xmf xmi xml xmm xmp xmr xmx xpe xpf xpl xpm xpp xrf xrx xxi xxl xxp xxx