--- /dev/null
+Begin in state A.
+Perform a diagnostic checksum after 6 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 B.
+
+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 A.
\ No newline at end of file