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zipper (clj)
(source)function
(zipper branch? children make-node root)
Creates a new zipper structure.
branch? is a fn that, given a node, returns true if can have
children, even if it currently doesn't.
children is a fn that, given a branch node, returns a seq of its
children.
make-node is a fn that, given an existing node and a seq of
children, returns a new branch node with the supplied children.
root is the root node.