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R t 2

R t 2R t 2R t 2R t 2R t 2R t 2
R t 2R t 2R t 2R t 2R t 2R t 2
R t 2R t 2R t 2R t 2R t 2R t 2R t 2R t 2R t 2R t 2R t 2R t 2R t 2R t 2R t 2R t 2R t 2R t 2R t 2R t 2R t 2