table constructors

["ted" <orangeted@...>]

I'm trying to construct a 2d associative array like this

temp = {"a", "b"}
temp["a"] = {"a" = 0, "b" = 2}
temp["b"] = {"a" = 1, "b" = 0}

What's wrong with the syntax? I'm trying to achieve this..

temp = {"a", "b"}

temp["a"] = {}
temp["a"]["a"] = 0
temp["a"]["b"] = 2

temp["b"] = {}
temp["b"]["a"] = 1
temp["b"]["b"] = 0

thanks