<｜begin▁of▁sentence｜>### Instruction:
As a nurse in a healthcare facility, you might encounter scenarios where you need to create and display hulls connecting specific coordinates of medical equipment in a patient care environment. For instance, you may need to connect coordinates of specialized medical instruments using a polygonal shape to represent a particular treatment area in a patient's room. This can be achieved using the HullCollection class from the matplotlib's collections module. Assuming you have a predefined matplotlib axes object named 'ax', you can use this class to accomplish the task of creating and drawing the hulls with required corner smoothing.
### Response:
from matplotlib import collections as mc

# Define vertex coordinates
vertices = [(1, 2), (2, 3), (3, 1)]

# Create the hull collection with desired corner radius
corner_radius = 0.2
hull_collection = mc.HullCollection(vertices, corner_radius=corner_radius)

# Add hull collection to the current axes
ax.add_collection(hull_collection)

# Draw the hulls
hull_collection.draw(ax)

plt.show()
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