[sammyg2]

Here's a good one.
The story goes, a 5th grade girl came up with it and gave it to her teacher. The teacher couldn't come up with the answer and gave up. The girl told her the answer, the teacher thought it was so good he sent it to a college professor he knew.
The professor didn't get it so he had one of this classes work on it, no one came up with the answer.


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What is the difference between the first line and the second line?