<｜begin▁of▁sentence｜>### Instruction:
Given a graph whose edge set is [('A', 'B'), ('A', 'C'), ('C', 'D'), ('C', 'E'), ('D', 'E')], and a set S = {'A', 'C', 'D'}, can you calculate the node expansion of the set S using NetworkX?
### Response:
import networkx as nx

# Create a graph
G = nx.Graph()

# Add edges
G.add_edge('A', 'B')
G.add_edge('A', 'C')
G.add_edge('C', 'D')
G.add_edge('C', 'E')
G.add_edge('D', 'E')

# Define the set S
S = {'A', 'C', 'D'}

# Calculate the node expansion of the set S
expansion = nx.node_expansion(G, S)

print('Node expansion of the set S:', expansion)
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