public Set<FunctionNode> lookup(FunctionNode node) {
		TreeSet<FunctionNode> result = new TreeSet<FunctionNode>();
		int[] features = getBinIds(node);
		for (int ii = 0; ii < features.length; ++ii) {
			TreeSet<FunctionNode> list = binSys[ii].get(features[ii]);
			if (list != null) {
				result.addAll(list);
			}
		}
		return result;
	}
Returns the union of all the bins containing the exemplar FunctionNode.
These nodes are likely to similar to the exemplar, but need secondary testing.
@param node is the exemplar
@return a set of FunctionNodes
Ghidra/Features/VersionTrackingBSim/src/main/java/ghidra/feature/vt/api/BinningSystem.java