public static <V, E extends GEdge<V>> GraphNavigator<V, E> bottomUpNavigator() {
		return new GraphNavigator<>(false);
	}
Creates a bottom-down navigator, which is one that traverses the graph from the sink 
to the source.

@return the navigator
Ghidra/Framework/Graph/src/main/java/ghidra/graph/algo/GraphNavigator.java