static <A> Map<A, Int> msTopTenMap(MultiSet<A> ms, int n) {
  new LinkedHashMap<A, Int> map;
  if (ms != null)
    for (A a : ms.getTopTen(n))
      map.put(a, ms.get(a));
  ret map;
}

static <A> Map<A, Int> msTopTenMap(MultiSet<A> ms) {
  ret msTopTenMap(ms, 10);
}