public Arrangement(String[] datas) {
		this.datas = datas;
	}
@Test
	public void arrangementTest() {
		long result = Arrangement.count(4, 2);
		assertEquals(12, result);

		result = Arrangement.count(4, 1);
		assertEquals(4, result);

		result = Arrangement.count(4, 0);
		assertEquals(1, result);

		long resultAll = Arrangement.countAll(4);
		assertEquals(64, resultAll);
	}