Another key difference to the current sequence is that the two props have to touch their opposition number's shoulder.

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In the upper graph we assume the same sequence of events except for one crucial difference: that in 1991, when Liberty first became available, a guardian angel told you to cash completely out of TCI and put all your money into Liberty for three years.

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By changing the sequence of two scenes, Cassidy gave the film an added power -- which made all the difference to how his performance was perceived, Holbrook says.

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