fff ffi ffm ffp ffr ffs fif fii fim fip fir fis fmf fmi fmm fmp fmr fms fpi fpm fpp fpr fps frf fri frm frp frr frs fsf fsi fsm fsp fsr fss i-f iff ifi ifm ifp ifr ifs iif iii iim iip iir iis im- imf imi imm imp ims ipf ipi ipm ipp ipr ips ir- irf iri irm irp irr irs is- isf isi ism isp isr iss m-f m-r mff mfi mfm mfp mfr mfs mi- mif mii mim mip mir mis mmf mmi mmm mmp mmr mms mpf mpi mpm mpp mpr mps mrf mri mrm mrp mrr mrs msf msi msm msp msr mss p-p pff pfi pfm pfp pfr pfs pif pii pim pip pir pis pmf pmi pmm pmp pmr pms ppf ppi ppm ppp ppr pps prf pri prm prp prr prs ps- psf psi psm psp psr pss rff rfi rfm rfp rfr rfs rif rii rim rip rir ris rmf rmi rmm rmp rmr rms rpf rpi rpm rpp rpr rps rrf rri rrm rrp rrr rrs rsf rsi rsm rsp rsr rss sff sfi sfm sfp sfr sfs sif sii sim sip sir sis smf smi smm smp smr sms spf spi spm spp spr sps sr- srf sri srm srp srr srs ss- ssf ssi ssm ssp ssr sss