## Not run:
# X <- matrix(c(0,5,4,7,6,8,
# 5,0,7,10,9,11,
# 4,7,0,7,6,8,
# 7,10,7,0,5,9,
# 6,9,6,5,0,8,
# 8,11,8,9,8,0), ncol=6)
# rownames(X) <- colnames(X) <- LETTERS[1:6]
# tree <- NJ(X)
# print(tree)
# ## End(Not run)
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