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To incorporate changes from another branch, use the ``merge`` command.
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If no URL is given, a default is used, initially the branch this branch
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For example, if Bill made a branch from Mary's work, he can merge her
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subsequent changes by simply typing this::
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On the other hand, Mary might want to merge into her branch the work Bill
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has done in his. In this case, she needs to explicitly give the URL the
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default algorithm is a variation of *3-way merging* which
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works as follows. Given an ancestor A and two branches B and C,
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the following table provides the rules used.