eee eef eeg eem eep ef- efe eff efg efm efp ege egf egg egm egp em- eme emf emg emm emp ep- epe epf epg epm epp fee fef feg fem fep ffe fff ffg ffm ffp fge fgf fgg fgm fgp fme fmf fmg fmm fmp fpe fpg fpm fpp g-p ge- gee gef geg gem gep gfe gff gfm gfp ggg ggm ggp gme gmf gmg gmm gmp gpe gpf gpg gpm gpp m-f mee mef meg mem mep mfe mff mfg mfm mfp mge mgf mgm mgp mme mmf mmg mmm mmp mpe mpf mpg mpm mpp p-p pee pef peg pem pep pfe pff pfg pfm pfp pge pgf pgg pgm pgp pme pmf pmg pmm pmp ppe ppf ppg ppm ppp