eee eef eem een eep ees ef- efe eff efi efm efp efs eie eif eii eim ein eip eis em- eme emf emi emm emn emp ems en- ene enf eni enm enn enp ens ep- epe epf epi epm epn epp eps es- ese esf esi esm esn esp ess fee fef fei fem fen fep fes ffe fff ffi ffm ffn ffp ffs fie fif fii fim fin fip fis fme fmf fmi fmm fmn fmp fms fne fnf fni fnm fnn fnp fns fpe fpi fpm fpn fpp fps fse fsf fsi fsm fsn fsp fss i-f ie- iee ief iei iem ien iep ies ife iff ifi ifm ifn ifp ifs iie iif iii iim iin iip iis im- ime imf imi imm imn imp ims in- ine inf ini inm inn inp ins ipe ipf ipi ipm ipn ipp ips is- ise isf isi ism isn isp iss m-f mee mef mei mem men mep mes mfe mff mfi mfm mfn mfp mfs mi- mie mif mii mim min mip mis mme mmf mmi mmm mmn mmp mms mne mnf mni mnm mnn mnp mns mpe mpf mpi mpm mpn mpp mps mse msf msi msm msn msp mss n-i ne- nee nef nei nem nen nep nes nfe nff nfi nfn nfp nfs nie nif nii nim nin nip nis nme nmi nmm nmn nmp nms nne nnf nni nnm nnn nnp nns npe npf npi npm npn npp nps nse nsf nsi nsm nsn nsp nss p-p pee pef pei pem pen pep pes pfe pff pfi pfm pfn pfp pfs pie pif pii pim pin pip pis pme pmf pmi pmm pmn pmp pms pn- pne pnf pni pnm pnn pnp pns ppe ppf ppi ppm ppn ppp pps ps- pse psf psi psm psn psp pss se- see sef sei sem sen sep ses sfe sff sfi sfm sfn sfp sfs sie sif sii sim sin sip sis sme smf smi smm smn smp sms sne snf sni snm snn snp sns spe spf spi spm spn spp sps ss- sse ssf ssi ssm ssn ssp sss