<｜begin▁of▁sentence｜>### Instruction:
Given a graph with cycles that you wish to unfold into a tree using a breadth-first search, can you use the 'unfold_tree' method in igraph to duplicate vertices as necessary and create a tree structure?
### Response:
import igraph as ig

# Create a sample graph
graph = ig.Graph.Tree(6, 2)

# Add some more edges to create cycles
graph.add_edges([(0, 3), (1, 4)])

# Unfold the graph to remove cycles and create a tree structure
tree = graph.unfold_tree(mode=ig.IN)

ig.plot(tree)
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