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T _ N N _ L Clue
IN THE BACK. THE TRAIN WILL BE ACCELERATING SO IT WILL BE GOING FASTER WHEN THE BACK OF THE TRAIN ENTERS THE TUNNEL SO A PERSON IN THE BACK WILL SPEND LESS TIME IN THE TUNNEL IN THE BACK OF THE TRAIN. THE TRAIN WILL BE ACCELERATING SO IT WILL BE GOING FASTER WHEN THE BACK OF THE TRAIN ENTERS THE TUNNEL SO A PERSON IN THE BACK WILL SPEND LESS TIME IN THE TUNNEL YOU SHOULD GO FIRST, AND PUT A QUARTER AT THE EXACT CENTER OF THE TABLE. THEN, EACH TIME YOUR FRIEND PLACES A QUARTER DOWN, YOU SHOULD PLACE YOUR NEXT QUARTER IN THE SYMMETRIC POSITION ON THE OPPOSITE SIDE OF THE TABLE. THIS WILL ENSURE THAT YOU ALWAYS HAVE A PLACE TO PUT THE COIN, AND EVENTUALLY YOUR FRIEND WILL RUN OUT OF SPACE IN THE BACK. SEE, THE TRAIN IS STILL ACCELERATING AS IT IS LEAVING THE STATION SO THE TRAIN WILL BE MOVING FASTER WHEN THE BACK OF THE TRAIN ENTERS THE TUNNEL