<｜begin▁of▁sentence｜>### Instruction:
{'description': 'Given a graph with the edges set [(1, 2), (1, 3)], after freezing the graph, can you determine if the graph is frozen using NetworkX?', 'problem_to_solve': 'The code checks if the graph is immutable (frozen) to ensure no further modifications can be made to the structure of the graph.'}
### Response:
import networkx as nx

# Create a graph
g = nx.Graph()
# Add some edges
g.add_edges_from([(1, 2), (1, 3)])

# Freeze the graph to prevent further modification
nx.freeze(g)

# Check if the graph is frozen
print('Is the graph frozen?', nx.is_frozen(g))
<|EOT|>
