a-a aaa aad aae aan aap aax ad- ada add ade adn adp adx aea aed aee aen aep aex an- ana and ane ann anp anx ap- apa apd ape apn app apx ax- axa axe axn axp axx daa dad dae dan dap dax dda ddd dde ddn ddp ddx de- dea ded dee den dep dex dna dnd dne dnn dnp dpa dpd dpe dpn dpp dxd dxn dxp dxx eaa ead eae ean eap eax ed- eda edd ede edn edp edx eea eed eee een eep eex en- ena end ene enn enp ep- epa epd epe epn epp epx ex- exa exd exe exp exx naa nad nae nan nap nax nda ndd nde ndn ndp ne- nea ned nee nen nep nex nna nne nnn nnp npa npd npe npn npp nxd p-p paa pad pae pan pap pax pda pdd pde pdn pdp pdx pea ped pee pen pep pex pn- pna pnd pne pnn pnp pnx ppa ppd ppe ppn ppp ppx pxe xaa xad xan xap xda xde xed xee xen xep xex xna xpa xpd xpe xpn xpp xxp xxx