<BUG>package geometry.structure.grid;
public class Node {
protected final int index;
protected final Grid<? extends Node> grid;
public Node(Grid<? extends Node> grid, int index) {</BUG>
this.grid = grid;

package geometry.structure.grid;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;
public class Node {
@JsonProperty
protected final int index;
@JsonIgnore
protected Grid<? extends Node> grid;
public Node(Grid<? extends Node> grid, int index) {
this.grid = grid;
