a-a aaa aam aap aar aax ama amm amp amr amx ap- apa apm app apr apx ar- ara arm arp arr arx ax- axa axm axp axr axx m-r maa mam map mar max mma mmm mmp mmr mmx mpa mpm mpp mpr mpx mra mrm mrp mrr mrx mxa mxp mxr p-p paa pam pap par pax pma pmm pmp pmr pmx ppa ppm ppp ppr ppx pra prm prp prr prx pxm pxr ra- raa ram rap rar rax rma rmm rmp rmr rmx rpa rpm rpp rpr rpx rra rrm rrp rrr rxp rxr xaa xam xap xar xma xmm xmp xmr xmx xpa xpm xpp xrx xxp xxx