a-a a-c aaa aac aae aan aao ac- aca acc ace acn aco aea aec aee aen aeo an- ana anc ane ann ano aoa aoc aoe aon aoo c-- caa cac cae can cao cca ccc cce ccn cco ce- cea cec cee cen ceo cn- cna cnc cne cnn cno co- coa coc coe con coo eaa eac eae ean eao ec- eca ecc ece ecn eco eea eec eee een eeo en- ena enc ene enn eno eo- eoa eoc eoe eon eoo naa nac nae nan nao nca ncc nce ncn nco ne- nea nec nee nen neo nna nnc nne nnn nno no- noa noc noe non noo oaa oac oae oan oao oc- oca occ ocn oco oea oec oee oen oeo on- ona onc one onn ono oo- ooa ooc oon ooo