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In page History of film:

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The use of flash-back structures continued to develop in this period, with the usual way of entering and leaving a flash-back being through a dissolve.[citation needed] The Vitagraph Company's The Man That Might Have Been (William J. Humphrey, 1914), is even more complex, with a series of reveries and flash-backs that contrast the protagonist's real passage through life with what might have been, if his son had not died.