eee eef eem ees ef- efe eff efi efm efs eie eif eii eim eis em- eme emf emi emm ems es- ese esf esi esm ess fee fef fei fem fes ffe fff ffi ffm ffs fie fif fii fim fis fme fmf fmi fmm fms fse fsf fsi fsm fss i-f ie- iee ief iei iem ies ife iff ifi ifm ifs iie iif iii iim iis im- ime imf imi imm ims is- ise isf isi ism iss m-f mee mef mei mem mes mfe mff mfi mfm mfs mi- mie mif mii mim mis mme mmf mmi mmm mms mse msf msi msm mss se- see sef sei sem ses sfe sff sfi sfm sfs sie sif sii sim sis sme smf smi smm sms ss- sse ssf ssi ssm sss