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D t 1 t 2

D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2D t 1 t 2