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usr/lib/R/doc/manual/R-intro.pdf usr/share/doc/r-doc-pdf/manual/R-intro.pdf
usr/lib/R/doc/manual/R-lang.pdf  usr/share/doc/r-doc-pdf/manual/R-lang.pdf
usr/lib/R/doc/manual/refman.pdf  usr/share/doc/r-doc-pdf/manual/refman.pdf