Permutation matrices research.
  1. rg TODO src/
  2. Clean up git blob: 3fe94d749f62112dda1ff5f3fe68606b0237fe6f (c9e85c700dfd5ee8dcef9a6380731d75d59ee907:costas_10x10.txt) You can do this with git filter-branch (https://www.deployhq.com/git/faqs/removing-large-files-from-git-history).