Begin in state A. Perform a diagnostic checksum after 12172063 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 left. - Continue with state D. In state C: 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 0. - Move one slot to the right. - Continue with state C. In state D: 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 right. - Continue with state E. In state E: If the current value is 0: - Write the value 1. - Move one slot to the right. - Continue with state C. If the current value is 1: - Write the value 1. - Move one slot to the left. - Continue with state F. In state F: If the current value is 0: - Write the value 1. - Move one slot to the left. - Continue with state E. If the current value is 1: - Write the value 1. - Move one slot to the right. - Continue with state A.