a-a aaa aae aak aan aap aax aea aee aek aen aep aex aka ake akk akn akp an- ana ane ank ann anp anx ap- apa ape apk apn app apx ax- axa axe axk axn axp axx eaa eae eak ean eap eax eea eee eek een eep eex eka eke ekp en- ena ene enk enn enp ep- epa epe epn epp epx ex- exa exe exp exx ka- kaa kae kak kan kap kax ke- kea kee kek ken kep kex kke kkk kkn kkp kn- kna kne knk knn knp knx kpa kpe kpk kpn kpp naa nae nak nan nap nax ne- nea nee nek nen nep nex nka nke nkk nkn nkp nna nne nnk nnn nnp npa npe npn npp p-p paa pae pak pan pap pax pea pee pek pen pep pex pka pke pkn pkp pn- pna pne pnk pnn pnp pnx ppa ppe ppk ppn ppp ppx pxe pxk xaa xak xan xap xee xen xep xex xke xna xnk xpa xpe xpn xpp xxp xxx