<｜begin▁of▁sentence｜>### Instruction:
Given a graph whose edge set is [(0, 1), (1, 2), (2, 3), (3, 0), (4, 5)], and a set of communities [{0, 1, 2, 3}, {4, 5}], can you use the `is_partition` function in NetworkX to check if the communities form a valid partition of the graph's nodes?
### Response:
import networkx as nx

# Define the graph
G = nx.Graph()
G.add_edges_from([(0, 1), (1, 2), (2, 3), (3, 0), (4, 5)])

# Define communities
communities = [{0, 1, 2, 3}, {4, 5}]

# Determine if 'communities' is a valid partition of the graph
is_valid_partition = nx.algorithms.community.is_partition(G, communities)
print('Is valid partition:', is_valid_partition)
<|EOT|>
