text: import matplotlib.pyplot as plt
  
  from .grid import Grid
  
  # fig = plt.figure()
  # ax = fig.add_subplot(111, projection="3d")
  # ax.plot([1, 2, 3, 4, 5], [7, 4, 6, 2, 8], [4, 6, 8, 9, 2], "*")
  # ax.grid(True)
  # ax.set_title("grid on")
  
  # plt.show()
  
  
  def visualize_grid(grid: Grid):
      """Visualize grid."""
  