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Three mutually orthogonal Latin squares of order 10
Find three mutually orthogonal Latin squares of order 10 or prove none exist; more generally, pin down N(n) for the smallest open orders.
PR
PR 把工作从一条路线带到另一条；合并它就是采纳。
没有开放的 PR
PR 把工作从一个分支带到另一个分支。