fff ffi ffm ffr ffs fif fii fim fir fis fmf fmi fmm fmr fms frf fri frm frr frs fsf fsi fsm fsr fss i-f iff ifi ifm ifr ifs iif iii iim iir iis im- imf imi imm ims ir- irf iri irm irr irs is- isf isi ism isr iss m-f m-r mff mfi mfm mfr mfs mi- mif mii mim mir mis mmf mmi mmm mmr mms mrf mri mrm mrr mrs msf msi msm msr mss rff rfi rfm rfr rfs rif rii rim rir ris rmf rmi rmm rmr rms rrf rri rrm rrr rrs rsf rsi rsm rsr rss sff sfi sfm sfr sfs sif sii sim sir sis smf smi smm smr sms sr- srf sri srm srr srs ss- ssf ssi ssm ssr sss