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In this paper, we seek a natural problem and a natural distribution of instances such that any O(n^c-ϵ)-time algorithm fails to solve most instances drawn from the distribution, while the problem admits an n^c+o(1)-time algorithm that correctly solves all instances. Specifically, we consider the K_a,b counting problem in a random bipartite graph, where K_a,b is a complete bipartite graph for constants a and b. We proved that the K_a,b counting problem admits an n^a+o(1)-time algorithm if a≥ 8,arXiv:2010.05822v1 fatcat:zp5fqu4ro5abzethr3bvjwy4jy