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At time t, node 1 posts a tweet. Nodes 2 and 4 post at times t 2 and t 4 between t and t′ = t + D. Node 5, which follows 2, posts at some time t 5 between t′ and t″ = t′ + D. Therefore, the cascade C(1, t, D) is C(1, t, D) = {(1, t), (2, t 2), (4, t 4), (5, t 5)}.
