a-a aaa aae aam aap aax aea aee aem aep aex ama ame amm amp amx ap- apa ape apm app apx ax- axa axe axm axp axx eaa eae eam eap eax eea eee eem eep eex em- ema eme emm emp emx ep- epa epe epm epp epx ex- exa exe exp exx maa mae mam map max mea mee mem mep mex mma mme mmm mmp mmx mpa mpe mpm mpp mpx mxa mxp p-p paa pae pam pap pax pea pee pem pep pex pma pme pmm pmp pmx ppa ppe ppm ppp ppx pxe pxm xaa xam xap xee xem xep xex xma xmm xmp xmx xpa xpe xpm xpp xxp xxx