<｜begin▁of▁sentence｜>### Instruction:
Given a graph whose edge set is [(1, 2), (2, 3), (3, 4)], can you list the nonexistent edges in the graph using NetworkX?
### Response:
import networkx as nx

# Create a graph
G = nx.Graph()
G.add_edges_from([(1, 2), (2, 3), (3, 4)])

# Find the nonexistent edges in the graph
nonexistent_edges = list(nx.non_edges(G))
print('Nonexistent edges:', nonexistent_edges)
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