Draw a sequential circuit which maintains a two-bit value in two flip-flops (of any
kind), with two inputs: "add one" and "subtract one"'. The "add one" operation is
like a normal up counter, the output of the counter increases by one, "Subtract
one" performs the opposite function; e.g. a 3 will change to 2 (and then if the user
presses "add one" next, it will go back to 3). These two input will never be 1
simultaneously, and each time they are 1 they will stay at 1 "long enough" for any
purposes.
You can use any desired components such as any kind of flip-flops, etc;