river2sea72:
20111119 Roller Coaster Physics - 01
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20111119 Roller Coaster Physics - 02
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20111119 Roller Coaster Physics - 03
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20111119 Roller Coaster Physics - 05
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20111119 Roller Coaster Physics - 06
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20111119 Roller Coaster Physics - 07
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20111119 Roller Coaster Physics - 08
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20111119 Roller Coaster Physics - 09
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20111119 Roller Coaster Physics - 10
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20111119 Roller Coaster Physics - 11
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20111119 Roller Coaster Physics - 12
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20111119 Roller Coaster Physics - 13
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20111119 Roller Coaster Physics - 15