public int get(final int index) {
			return _path[index];
		}
Return the child index at the given index (child level).

@param index the path index
@return the child index at the given child level
@throws IndexOutOfBoundsException if the index is not with the range
        {@code [0, length())}
jenetics.ext/src/main/java/io/jenetics/ext/util/Tree.java