+ const std::vector<std::pair<std::string, std::string>> flows = {
+ {"Station 1", "Station 2"},
+ {"Station 3", "Station 4"},
+ {"Station 5", "Station 6"},
+ {"Station 7", "Station 8"},
+ {"Station 9", "Station 10"},
+ {"Station 11", "Station 12"},
+ {"Station 13", "Station 14"},
+ {"Station 15", "Station 16"},
+ {"Station 17", "Station 18"},
+ {"Station 19", "Station 20"},
+ {"Station 21", "Station 22"},
+ };