<｜begin▁of▁sentence｜>### Instruction:
Given a dendrogram instance which represents the hierarchical clustering of elements, how do you format the dendrogram to obtain a string representation in Newick format?
### Response:
import igraph as ig

# Assume that 'dendrogram' is an instance of igraph's Dendrogram class
# Convert the dendrogram to Newick format
newick_format = dendrogram.format(format='newick')

print(newick_format)
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