svoid test_allContainedWordSets() {
  Set<S> found1 = litciset("turn", "around"),
    found2 = litciset("turn");
    
  assertEqualsVerbose(lithashset(found1, found2),
    asHashSet(allContainedWordSets("you turn my World around", ll(
      found1,
      found2,
      litciset("turn", "up"),
      litciset("bla")
    ))));
}