// class dictionary

import edu.neu.ccs.demeter.dj.*;
Input = List(A) EOF.
List(S) ~ "(" S {"," S} ")".
Main = <s> String.
A = ["x" X] ["r" R].
B = ["b" B] D.
R = S.
S = ["t" T] C.
C = D.
X = B.
T = R.
D = .