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R f t

R f tR f tR f tR f t
R f tR f tR f tR f tR f tR f tR f tR f t
R f tR f tR f tR f tR f tR f tR f tR f tR f tR f tR f tR f t
R f tR f tR f tR f tR f tR f tR f tR f tR f tR f tR f tR f tR f tR f tR f tR f t
R f tR f tR f tR f tR f tR f tR f tR f t