<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def parameters(self):
 """Returns tuple of selection parameters of self (self.block_tl, self.block_br, self.rows, self.cols, self.cells) """


        return self.block_tl, self.block_br, self.rows, self.cols, self.cells