A4Options opt = new A4Options();
Command cmd = new Command(false, 3, 3, 3, expr.and(fact));
A4Solution sol = TranslateAlloyToKodkod.execute_command(NOP, sigs, cmd, opt);
System.out.println(sol.toString().trim());
if (sol.satisfiable()) {
System.out.println("In particular, File = " + sol.eval(file));
System.out.println("In particular, Dir = " + sol.eval(dir));
System.out.println("In particular, contains = " + sol.eval(contains));
System.out.println("In particular, parent = " + sol.eval(parent));
}
System.out.println();