31     abstract Iterable<N> getChildren(N node);  in getChildren()  method in TraverserRewrite.TreeTraverserPreOrder
35       return TreeTraverser.using((N node) -> getChildren(node)).preOrderTraversal(root);  in before1()
43           return getChildren(node);  in before2()
50       return Traverser.forTree((N node) -> getChildren(node)).depthFirstPreOrder(root);  in after()
56     abstract Iterable<N> getChildren(N node);
60       return TreeTraverser.using((N node) -> getChildren(node)).postOrderTraversal(root);
68           return getChildren(node);
75       return Traverser.forTree((N node) -> getChildren(node)).depthFirstPostOrder(root);
81     abstract Iterable<N> getChildren(N node);
85       return TreeTraverser.using((N node) -> getChildren(node)).breadthFirstTraversal(root);
93           return getChildren(node);
100       return Traverser.forTree((N node) -> getChildren(node)).breadthFirst(root);