<｜begin▁of▁sentence｜>### Instruction:
Given a path graph with nodes 0 to 3, how can you visually represent it using a shell layout with node 0 in the inner shell and nodes 1, 2, and 3 in the outer shell?
### Response:
import networkx as nx
import matplotlib.pyplot as plt

# Create a networkx graph
G = nx.path_graph(4)

# Define shells
shells = [[0], [1, 2, 3]]

# Draw the graph using shell layout
nx.draw_shell(G, nlist=shells)
plt.show()
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