a-a a-c aaa aac aae aau aax ac- aca acc ace acu acx aea aec aee aeu aex au- aua auc aue aux ax- axa axe axx c-- caa cac cae cau cax cca ccc cce ccu ccx ce- cea cec cee ceu cex cua cuc cue cuu cxc cxx eaa eac eae eau eax ec- eca ecc ece ecu ecx eea eec eee eex eu- eua euc eue eux ex- exa exc exe exu exx ua- uaa uac uae uau uca ucc uce ucu uea uec uee uua uuc uue uuu uxc uxu xaa xac xau xcx xee xeu xex xue xxx