# Closure of disjoint sets

I am trying to solve the following problem but I cannot figure out two disjoint sets such that their closures are equal.
Find languages S and T over the alphabet {a, b} such that $$S \not\subset T$$ and $$T \not\subset\ S$$ (S is not contained in T and T is not contained in S) but S* = T*. It might be trivial, but I would appreciate some help. Thanks.