'[{"coordinate":[1,4],"connectedNodes":[1]},'
            + '{"coordinate":[2,4],"connectedNodes":[0,2]},'
            + '{"coordinate":[2,5],"connectedNodes":[3,1]},'
            + '{"coordinate":[3,5],"connectedNodes":[2,4,20]},'
            + '{"coordinate":[4,5],"connectedNodes":[3,5]},'