### Question:
GeoHash { public static String bottom(String hash) { return adjacentHash(hash, Direction.BOTTOM); } private  GeoHash(); static String adjacentHash(String hash, Direction direction); static String right(String hash); static String left(String hash); static String top(String hash); static String bottom(String hash); static String adjacentHash(String hash, Direction direction, int steps); static List<String> neighbours(String hash); static String encodeHash(double latitude, double longitude); static String encodeHash(LatLong p, int length); static String encodeHash(LatLong p); static String encodeHash(double latitude, double longitude, int length); static LatLong decodeHash(String geohash); static int hashLengthToCoverBoundingBox(double topLeftLat, double topLeftLon,
            double bottomRightLat, double bottomRightLon); static boolean hashContains(String hash, double lat, double lon); static Coverage coverBoundingBox(double topLeftLat, final double topLeftLon,
            final double bottomRightLat, final double bottomRightLon); static Coverage coverBoundingBoxMaxHashes(double topLeftLat, final double topLeftLon,
            final double bottomRightLat, final double bottomRightLon, int maxHashes); static Coverage coverBoundingBox(double topLeftLat, final double topLeftLon,
            final double bottomRightLat, final double bottomRightLon, final int length); static double heightDegrees(int n); static double widthDegrees(int n); static String gridAsString(String hash, int size, Set<String> highlightThese); static String gridAsString(String hash, int fromRight, int fromBottom, int toRight,
            int toBottom); static String gridAsString(String hash, int fromRight, int fromBottom, int toRight,
            int toBottom, Set<String> highlightThese); static final int MAX_HASH_LENGTH; static final int DEFAULT_MAX_HASHES; }### Answer:
@Test public void testBottom() { assertEquals("u0zz", bottom("u1pb")); }