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Mammal's teeth divided into the 4 groups: incisors, canines, premolars and molars.
data(dentitio)
A data frame with 66 observations on the following 8 variables.
top incisors
bottom incisors
top canines
bottom canines
top premolars
bottom premolars
top molars
bottom molars
John A. Hartigan: Clustering Algorithms. Wiley, New York, 1975.