local color = {"Blue", "Green", "Red"}
local group = {1, 2, 3}

for i=1.3 do
  cmd(string.format('group %i ; store color %q ; clearall', group[i], color[j]))
end

local color = {"Blue", "Green", "Red"}
local group = {1, 2, 3}
for i=0, 8 do
    local g = math.floor(i/3)
    local c = i-3*g
    print(string.format('group %i ; store color %q ; clearall', group[g+1], color[c+1]))
end