SetVar[] S = new SetVar[2];
for (int i = 0; i < S.length; i++) {
S[i] = VF.set("S_" + i, new int[]{1, 2, 3, 4}, solver);
}
IntVar I = VF.enumerated("I", 1, 5, solver);
SetVar T = VF.set("T", 1, 3, solver);
solver.post(SCF.element(I, S, 1, T));
Solver copy = solver.duplicateModel();