Then, I learned how to start at zero, and then end at a digit before the final number.

Finally, I was excited when I figured out how to make it count down... From the final number to zero.

Unfortunately, I have no idea how to start the number at "N" and end at "Y" (where "N" is a number after zero and "Y" is a number before the final number) and count down from "Y" to "N".

For example, I played with a mod-7 counter for around an hour to try and get it to start at two and end at 5. I got the counter to start at two, go to three, and then stay there for the rest of the day...

Failure at its finest, please help me.

I have a final coming up soon and even my teacher doesn't seem to understand this :-(