# B: 0, C: 0, L: 1, c: 0
i  
# B: 2, C: 2, L: 1, c: 2
L\x0a
# B: 3, C: 3, L: 2, c: 0
i    
# B: 7, C: 7, L: 2, c: 4
-a
# B: 8, C: 8, L: 2, c: 5
b\x0a
# B: 9, C: 9, L: 3, c: 0
L\x0a
# B: 10, C: 10, L: 4, c: 0
i    
# B: 14, C: 14, L: 4, c: 4
-b