code: def box(self, row, col):
          
          box = []
          box_i = (row // self.order) * self.order
          box_j = (col // self.order) * self.order
          for i in utils.range_(box_i, box_i + self.order):
              for j in utils.range_(box_j, box_j + self.order):
                  box.append(self[i][j])
          return box
docs: Get the values of the box pertaining to the specified row and column of the Sudoku