@Test public void maprotate() throws Exception
	{
		assertEquals(
			new HashMap<String, Set<String>>() {{
				put("ho", new HashSet<String>() {{ add("hi"); add("monk's"); }});
				put("rock", new HashSet<String>() {{ add("ponies"); }});
			}},
			NIH.rotate(new HashMap<String, String>() {{
				put("hi", "ho");
				put("monk's", "ho");
				put("ponies", "rock");
			}}));
	}