c-- ccc cce cch cco ccx ce- cec cee ceh ceo cex ch- chc che chh cho chx co- coc coe coh coo cox cxc cxh cxo cxx ec- ecc ece ech eco ecx eec eee eeo eex ehc ehe ehh eho eo- eoc eoe eoh eoo ex- exc exe exh exo exx hcc hce hch hco he- hec hee heh heo hex hhc hhe hhh hho hoc hoe hoh hoo hox hxc oc- occ och oco ocx oec oee oeh oeo oex ohc ohe ohh oho oo- ooc ooh ooo oox ox- oxc oxo oxx xch xcx xee xex xoc xoo xox xxo xxx