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the kind of flow of people back and forth,
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and even some flows that end.
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There was, since the sixteenth century,
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this pattern of seasonal migration,
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of men, only men,
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walking, walking every year all the way from this part of Central France
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to Paris, to Rouen,
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to other northern cities
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to work in the construction industry.
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They started that in the sixteenth century
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and they walked every March,
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and then they'd come back every November,