[(10, 5), (30, 5), (30, 15), (10, 15)] right, 19 down, 9 left, 19 up, 9 ........................................ ........................................ ........................................ ........................................ .........*===================*.......... .........|...................|.......... .........|...................|.......... .........|...................|.......... .........|...................|.......... .........|...................|.......... .........|...................|.......... .........|...................|.......... .........|...................|.......... .........|...................|.......... .........*===================*.......... ........................................ ........................................ ........................................ ........................................ ........................................