What is the intersection between complete bipartite graphs and complements of bipartite graphs?

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For context, I am in an intro Graph theory course. I know that the complement of a bipartite graph can be bipartite, but I don't know how to determine all of them and whether they can be complete. I assume the intersection is not empty but I am not sure. Any help is appreciated, thanks!

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The complement of a complete bipartite graph $K_{m,n}$ is the union of the two complete graphs $K_m\cup K_n$. That complement is bipartite if and only if $m<3$ and $n<3$. If $m,n>0$ then the complement will never be complete since it is not even connected.