Printing multiple ggplots into a single pdf, multiple plots per page

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This solution is independent of whether the lengths of the lists in the list p are different.

library(gridExtra)

pdf("plots.pdf", onefile = TRUE)
for (i in seq(length(p))) {
  do.call("grid.arrange", p[[i]])  
}
dev.off()

Because of onefile = TRUE the function pdf saves all graphics appearing sequentially in the same file (one page for one graphic).

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