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F x 2x

F x 2xF x 2xF x 2xF x 2xF x 2xF x 2x
F x 2xF x 2xF x 2xF x 2xF x 2xF x 2x
F x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2xF x 2x