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Given a set of variables, compute the inclusion indicators for all possible subsets.
all_subsets(set)
a data frame where the rows indicate the 2^p different subsets and the columns indicate inclusion (logical) for each element in that subset
2^p
the set from which to compute all subsets (e.g., 1:p)
1:p
Code adapted from <https://www.r-bloggers.com/2012/04/generating-all-subsets-of-a-set/>