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Different types of signed triads, balanced (B) or unbalanced (U) according to the strong or weak formulation of structural balance. We show the number of each type of triad NΔ in the friendship–enmity multiplex network, the expected number 
of such triads when averaged over 1,000 sign randomizations, and the corresponding z score (see SI Text). Triads + + + and + − − are overrepresented; + + − triads are underrepresented with extraordinary significance.
