a-a a-c aaa aac aae aah aao ac- aca acc ace ach aco aea aec aee aeh aeo aha ahc ahe ahh aho aoa aoc aoe aoh aoo c-- caa cac cae cah cao cca ccc cce cch cco ce- cea cec cee ceh ceo ch- cha chc che chh cho co- coa coc coe coh coo eaa eac eae eah eao ec- eca ecc ece ech eco eea eec eee eeo eha ehc ehe ehh eho eo- eoa eoc eoe eoh eoo haa hac hae hah hao hca hcc hce hch hco he- hea hec hee heh heo hha hhc hhe hhh hho hoa hoc hoe hoh hoo oaa oac oae oah oao oc- oca occ och oco oea oec oee oeh oeo oha ohc ohe ohh oho oo- ooa ooc ooh ooo