<｜begin▁of▁sentence｜>### Instruction:
{'description': 'You want to find out how many distinct trees (nonisomorphic trees) you can create with a certain number of nodes (order).', 'data': {'order': 4}, 'problem': 'Determine the number of different unlabeled trees that can be formed with 4 nodes.'}
### Response:
import networkx as nx

# Calculate the number of nonisomorphic trees for a given order
num_trees = nx.number_of_nonisomorphic_trees(order)

print('Number of nonisomorphic trees of order {}:'.format(order), num_trees)
<|EOT|>
