Edge getPreviousEdgeWithSameTo(Edge e) {
		int indexOfEdge = index(e);
		if (indexOfEdge >= 0) {
			return previousEdgeWithSameTo[indexOfEdge];
		}
		return null;
	}
Returns previous edge having the same 'to' if it exists. Otherwise returns
	  null.
Ghidra/Framework/Generic/src/main/java/ghidra/util/graph/EdgeSet.java