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. 2021 Oct 13;21(20):6815. doi: 10.3390/s21206815
Algorithm 1. The algorithm of permission availability detection.
  Input: Permission element urij, 1 ≤ i ≤ m, 1 ≤ j ≤ n
  Output: Permissions available or unavailable
     Result = Available; // The result is initialized to available rights.
     for i = 1:m, do
       for x = i + 1:m do
        for j = 1:n do
         for y = j + 1:n do
          if urij = urxy or IsPartof(urij, urxy) then
           // The two permission elements are equal or contain
            result = Available;
            return result;
          else if (urij ≠ urxy)then
            result = NotAvailable;
          end if
         end for
       end for
       end for
     end for
     return result