/** a node in the GSS */
final class Node implements Invokable<Position, Node, Node>, IntegerMappable, GraphViz.ToGraphViz {
public FastSet<Node> set = new FastSet<Node>();
/** a node in the GSS */
final class Node implements Invokable<Position, Node, Node>, IntegerMappable, GraphViz.ToGraphViz {
public FastSet<Node> set = new FastSet<Node>();