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R n 1 r n 2

R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2
R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2
R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2R n 1 r n 2