unvisited (unvisited) unvisited (visited) visited (unvisited) visited (visited)
unvisited (unvisited) unvisited (visited) visited (unvisited) visited (visited)
unvisited (unvisited) unvisited (visited) visited (unvisited) visited (visited)
unvisited (unvisited) unvisited (visited) visited (unvisited) visited (visited)