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What grade is the pigeon's nest principle?
The principle of pigeon nest, the second volume of sixth grade mathematics, People's Education Press.

"Mathematics Wide Angle" is the content of Unit 5 in the second volume of Grade 6 of People's Education Press. Among mathematical problems, there is a kind of problem related to "existence". For example, in any 367 students, two students' birthdays must be on the same day.

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