fff ffi ffm ffo ffp fif fii fim fip fmf fmi fmm fmo fmp fof foi fom foo fop fpi fpm fpo fpp i-f iff ifi ifm ifo ifp iif iii iim iio iip im- imf imi imm imo imp io- iof ioi iom ioo iop ipf ipi ipm ipo ipp m-f m-o mff mfi mfm mfo mfp mi- mif mii mim mio mip mmf mmi mmm mmo mmp mof moi mom moo mop mpf mpi mpm mpo mpp o-i of- off ofi ofm ofo ofp oif oii oim oio oip om- omf omi omm omo omp oo- oof ooi oom ooo oop op- opf opi opm opo opp p-p pff pfi pfm pfo pfp pif pii pim pio pip pmf pmi pmm pmo pmp pof poi pom poo pop ppf ppi ppm ppo ppp