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F s 1 s 2

F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2F s 1 s 2