innerValues.java

	/**
	 * Returns an Iterable of all the values in all the submaps of the parent map.
	 */
	<K1, K2, T> Iterable<T> innerValues(Map<K1, Map<K2, T>> map) {
		return Iterables.concat(
				Iterables.transform(map.values(), 
						new Function<Map<K2, T>, Iterable<T>>() {
							@Override
							public Iterable<T> apply(Map<K2, T> innerMap) {
								return innerMap.values();
							}
						}
				)
			);
	}

This gist was written before java had streams. If I was doing this now, it would be like this: ...

    /**
     * Returns a Stream of all the values in all the submaps of the parent map.
     */
    <K1, K2, T> Stream<T> innerValues(Map<K1, Map<K2, T>> map) {
        return map.values().stream().flatMap(m2 -> m2.values().stream());
    }