<｜begin▁of▁sentence｜>### Instruction:
Given a graph structure that could be loaded with the formula 'a-b-c-d-a-c-d-b', can you calculate the biconnected components and also identify the articulation points within the structure using the biconnected_components function from the igraph library?
### Response:
from igraph import Graph

# Load a graph
graph = Graph.Formula('a-b-c-d-a-c-d-b')

# Calculate the biconnected components, optionally including articulation points
bicomponents, articulation_points = graph.biconnected_components(return_articulation_points=True)

# Print the results
print('Biconnected components:', bicomponents)
print('Articulation points:', articulation_points)
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