code: @Override
      public Matrix applyCommon(Matrix a, Matrix b) {
          int n = a.rows() * b.rows();
          int m = a.columns() * b.columns();
          int p = b.rows();
          int q = b.columns();
  
          Matrix result = a.blankOfShape(n, m);
  
          for (int i = 0; i < n; i++) {
              for (int j = 0; j < m; j++) {
                  result.set(i, j, a.get(i / p, j / q) * b.get(i % p, j % q));
              }
          }
  
          return result;
      }
docs: TODO: It should not be common.