I've got most of the formulas worked out, but the Counter still isn't working properly. The ones that I think are wrong are: K' = B'C'D' I came up with K = BCD But I am sure that is incorrect. I just don't know what to do with it. K' = A'D' + A'C' I came up with K = (A+D)(A+C) Which I figured out after I posted this is correct! Yay for me! Everything else I did looks good to me, so if it still doesn't work after some help, I will post more information. Thanks in advance to anyone who helps out!