eee eef eek eem eep ef- efe eff efm efp eke ekf ekp em- eme emf emk emm emp ep- epe epf epm epp fee fef fek fem fep ffe fff ffk ffm ffp fkf fkk fkm fkp fme fmf fmm fmp fpe fpk fpm fpp ke- kee kef kek kem kep kff kfm kke kkk kkm kkp kme kmf kmk kmm kmp kpe kpf kpk kpm kpp m-f mee mef mek mem mep mfe mff mfm mfp mke mkk mkm mkp mme mmf mmk mmm mmp mpe mpf mpk mpm mpp p-p pee pef pek pem pep pfe pff pfk pfm pfp pke pkf pkm pkp pme pmf pmk pmm pmp ppe ppf ppk ppm ppp