a-a aaa aad aae aap aax ad- ada add ade adp adx aea aed aee aep aex ap- apa apd ape app apx ax- axa axe axp axx daa dad dae dap dax dda ddd dde ddp ddx de- dea ded dee dep dex dpa dpd dpe dpp dxd dxp dxx eaa ead eae eap eax ed- eda edd ede edp edx eea eed eee eep eex ep- epa epd epe epp epx ex- exa exd exe exp exx p-p paa pad pae pap pax pda pdd pde pdp pdx pea ped pee pep pex ppa ppd ppe ppp ppx pxe xaa xad xap xda xde xed xee xep xex xpa xpd xpe xpp xxp xxx