sentinel, 0,0, 1,0, 0,1, 1,1, 37,0, 42,0, 7,0, 10,0, 11,0, 15,0, 79,0, 53,0, 0,1, 1,1, 37,1, 42,1, 7,1, 10,1, 11,1, 15,1, 79,1, 53,1