<｜begin▁of▁sentence｜>### Instruction:
Given the degree sequence [3, 2, 2, 1, 0], how would you calculate and print the Bethe Hessian matrix for the graph created using the Havel-Hakimi algorithm, with the regularizer parameter r set to 2?
### Response:
import networkx as nx
# Create a graph using the Havel-Hakimi algorithm based on a degree sequence
k = [3, 2, 2, 1, 0]
G = nx.havel_hakimi_graph(k)

# Calculate the Bethe Hessian matrix with the regularizer r set to the ratio of 2
r = 2
H = nx.bethe_hessian_matrix(G, r=r)

# Convert the Bethe Hessian matrix to a dense array
H_dense = H.toarray()
print(H_dense)
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