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Voting mathematics
Everyone has 45 choices.

ab ac ad ae af ag ah ai aj

bc bd be bf bg bh bi bj

cd ce cf cg ch ci cj

De df dg dh di dj

ef eg eh ei ej

Fiber, fiber, fiber.

gh gi gj

Hi hj

In the neck

If there are 405 people, in theory, there can be 9 people to choose from in each situation. There is no guarantee that no less than 65,438+00 voters will vote for the same two candidates. If there are 406 people, it can be guaranteed.