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R r1 r2

R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2R r1 r2