Begin in state A.
Perform a diagnostic checksum after 12481997 steps.

In state A:
  If the current value is 0:
    - Write the value 1.
    - Move one slot to the right.
    - Continue with state B.
  If the current value is 1:
    - Write the value 0.
    - Move one slot to the left.
    - Continue with state C.

In state B:
  If the current value is 0:
    - Write the value 1.
    - Move one slot to the left.
    - Continue with state A.
  If the current value is 1:
    - Write the value 1.
    - Move one slot to the right.
    - Continue with state D.

In state C:
  If the current value is 0:
    - Write the value 0.
    - Move one slot to the left.
    - Continue with state B.
  If the current value is 1:
    - Write the value 0.
    - Move one slot to the left.
    - Continue with state E.

In state D:
  If the current value is 0:
    - Write the value 1.
    - Move one slot to the right.
    - Continue with state A.
  If the current value is 1:
    - Write the value 0.
    - Move one slot to the right.
    - Continue with state B.

In state E:
  If the current value is 0:
    - Write the value 1.
    - Move one slot to the left.
    - Continue with state F.
  If the current value is 1:
    - Write the value 1.
    - Move one slot to the left.
    - Continue with state C.

In state F:
  If the current value is 0:
    - Write the value 1.
    - Move one slot to the right.
    - Continue with state D.
  If the current value is 1:
    - Write the value 1.
    - Move one slot to the right.
    - Continue with state A.