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Galled networks, reticulation visible networks, nearly-stable networks and stable-child networks are the four classes of phylogenetic networks that are recently introduced to study the topological and algorithmic aspects of phylogenetic networks. We prove the following results.\n  (1) A binary galled network with n leaves has at most 2(n-1) reticulation nodes. (2) A binary nearly-stable network with n leaves has at most 3(n-1) reticulation nodes. 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