Use List for Subsets instead of a Dictionary for performance reasons. Fix issue with List literals. Compiled compiler is now self-hosting.

B = R(A, L(B, R(C,D)))
C = R(B, R(C, D))
X = L(X, L(A, L(B, R(C,D))))
A = L(X, L(A, L(B, R(C,D))))
E = L(E, L(C, D))
D = R(E, L(C, D))