{
String a = "a";
String b = "b";
String c = "c";
List<Choice1> choice1 = Arrays.asList(new Choice1[]{new Choice1(a, null), new Choice1(null, b)});
List<Choice2> choice2 = Arrays.asList(new Choice2[]{new Choice2(a, b, null), new Choice2(a, null, c)});
Root root = new Root();
root.setChoice1(choice1);
root.setChoice2(choice2);