I have a struct representing a node in a graph. All instances of this 
struct store a list of references/pointers to their immediate neighbors in 
the graph. The following is what the struct looks like in C++:

struct Node {
  string name;
  vector<Node*> neighbors;

  //  ...

Suppose I have 4 nodes marking the corners of a square, each node would 
hold pointers to two neighbors. How do I represent the above struct as a 
protocol buffer message?

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