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_mod_revision.check_not_reserved_id(revision_id)
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if len(revision_ids) == 0:
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self._parent_ids = revision_ids
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self._branch_revision_id = revision_ids[0]
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def set_parent_trees(self, parents_list, allow_leftmost_as_ghost=False):
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"""See MutableTree.set_parent_trees()."""