for (int i = 5; i < 15; i++) {
x2.add(i);
}
Plume p = new LocalPlume();
PCollection<Integer> x3 = p.flatten(p.fromJava(x1), p.fromJava(x2));
PTable<Integer, Integer> x4 = x3.count();
Map<Integer, Integer> r = Maps.newHashMap();
for (Pair<Integer, Integer> pair : x4) {
r.put(pair.getKey(), pair.getValue());