-er eee eef eem eer ees ef- efe eff efi efm efr efs eie eif eii eim eir eis em- eme emf emi emm emr ems ere erf eri erm err ers es- ese esf esi esm esr ess fee fef fei fem fer fes ffe fff ffi ffm ffr ffs fie fif fii fim fir fis fme fmf fmi fmm fmr fms fre frf fri frm frr frs fse fsf fsi fsm fsr fss i-f ie- iee ief iei iem ier ies ife iff ifi ifm ifr ifs iie iif iii iim iir iis im- ime imf imi imm ims ir- ire irf iri irm irr irs is- ise isf isi ism isr iss m-f m-r mee mef mei mem mer mes mfe mff mfi mfm mfr mfs mi- mie mif mii mim mir mis mme mmf mmi mmm mmr mms mre mrf mri mrm mrr mrs mse msf msi msm msr mss re- ree ref rei rem rer res rfe rff rfi rfm rfr rfs rie rif rii rim rir ris rme rmf rmi rmm rmr rms rrf rri rrm rrr rrs rse rsf rsi rsm rsr rss se- see sef sei sem ser ses sfe sff sfi sfm sfr sfs sie sif sii sim sir sis sme smf smi smm smr sms sr- sre srf sri srm srr srs ss- sse ssf ssi ssm ssr sss