<｜begin▁of▁sentence｜>### Instruction:
As a phlebotomist working in a hospital laboratory, part of your routine involves collecting blood samples from patients or donors. You use venipuncture or capillary puncture techniques to obtain these samples. Once collected, you carefully label each specimen, ensuring accuracy and traceability. Following standard procedures and safety guidelines, you then store or transport the blood specimens for further analysis, testing, or transfusion.

In your laboratory, you utilize various tools and techniques to assist in medical diagnosis, treatment, or research. Among these tools is the 'to_undirected' method from the 'igraph' API. This method allows you to convert directed graphs into undirected ones, which can be particularly useful in analyzing interconnected relationships within biological systems or patient data.
### Response:
from igraph import Graph

# Assume we already have a directed graph 'g' loaded from a file or defined inline
g = Graph([(0, 1), (1, 2), (2, 3), (3, 1)], directed=True)

# Convert the directed graph to an undirected graph
undirected_g = g.to_undirected()

# Print the edge list to verify the conversion
print(undirected_g.get_edgelist())
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