https://www.vps.fmvz.usp.br/CRAN/web/packages/doParallel/index.html
CRAN: Package doParallel
Provides a parallel backend for the %dopar% function using the parallel package.
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https://www.r-project.org/nosvn/R.check/r-devel-linux-x86_64-debian-clang/doParallel-00check.html
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