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R x 2

R x 2R x 2R x 2R x 2
R x 2R x 2R x 2R x 2R x 2R x 2R x 2R x 2
R x 2R x 2R x 2R x 2R x 2R x 2R x 2R x 2R x 2R x 2R x 2R x 2
R x 2R x 2R x 2R x 2R x 2R x 2R x 2R x 2R x 2R x 2R x 2R x 2R x 2R x 2R x 2R x 2
R x 2R x 2R x 2R x 2R x 2R x 2R x 2R x 2