turing 152.0 208.0 337.0 198.0 501.0 193.0 632.0 206.0 753.0 266.0 170.0 369.0 1 1 a a L 1 1 X X L 4 4 b b L 4 4 X X L 0 1 b X L 4 0 R 3 3 X X R 0 0 X X R 0 0 a a R 2 2 b b R 2 2 X X R 3 3 b b R 2 3 a X R 0 5 R 3 4 a X L 1 2 R