How about using perpetual numbers for your drawn number input.All you would need to do is divide it into 3 sections.THe first section would be the oldest draws in it you would be looking for digits that show up 2 or more times in it position(column).Section 2 you would be looking for the digit to show up 1 or none times in its position(column) and if it show up 2 or more times its disquilifed as a perpetual number in it position(column).Section 3 you will be looking to see if the digit show up in its position(column) if it does its disqulifed, but if it does not show up it passes this section ...This would work for either pick 3 or pick 4 games....