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S_{n^{2}}

C H_{3} X > R C H_{2} > R_{2} C H X > R_{3} C X

R C H_{2} X > C H_{3} X > R_{2} C H X > R_{3} C H X

C H_{3} X > R C H_{2} X > R_{3} C X > R_{2} C H X

R_{3} C X > R_{2} C H X > R C H_{2} X > C H_{3} X

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