[1] 0  0  1  1 

1. a 1 1 R a
 1 [0] 0  1  1 

2. a 0 0 R a
 1  0 [0] 1  1 

2. a 0 0 R a
 1  0  0 [1] 1 

1. a 1 1 R a
 1  0  0  1  [1] 

1. a 1 1 R a
 1  0  0  1  1  [ ] 

3. a B B L b
 1  0  0  1 [1]   

5. b 1 0 L b
 1  0  0 [1] 0    

5. b 1 0 L b
 1  0 [0] 0  0    

4. b 0 1 L c
 1 [0] 1  0  0    

7. c 0 0 L c
[1] 0  1  0  0    

9. c 1 1 L c
[ ] 1  0  1  0  0    

8. c B B R S
   [1] 0  1  0  0