Last year, I posed the question above. The most common answer is the one posted below. But if you really want to unlearn, I encourage you to keep searching for answers. The problem can actually be solved using only three lines. In fact, there is even a way to do it using only one line. (The quiz and the possibility for multiple answers is a wonderful metaphor for the idea that you should never stop searching for better solutions — i.e. just because you "solved" a problem that doesn't imply you solved it in the best or most effective or efficient manner.)
The bottom-line? Unlearning doesn't just require you to think outside the box, you need to think inside-out the box. Hell, you must even question the idea that there needs to be a box!
The three line solution:
And the one line solutions: