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    int game_dim = json_obj["game_dim"];
    std::string game_state = json_obj["game_state"];
    
    std::string blue = json_obj["blue"];
    std::vector<std::vector<int>> blue_heads = json_obj["blue_heads"];
    int blue_score = json_obj["blue_score"];
    
    std::string red = json_obj["red"];
    std::vector<std::vector<int>> red_heads = json_obj["red_heads"];
    int red_score = json_obj["red_score"];