svoid test_startsWithOneOf_treeSet() {
  print("1");
  assertTrue(startsWithOneOf_treeSet("potato", littreeset("pot")));
  print("2");
  assertTrue(startsWithOneOf_treeSet("potato", littreeset("pot", "potash")));
  print("3");
  assertTrue(startsWithOneOf_treeSet("potato", littreeset("pot", "pota")));
  print("4");
  assertFalse(startsWithOneOf_treeSet("potato", littreeset("potash")));
}