$($

$2$

$0$

$$points

$)$

$$Rather than generating a language or a set of numbers, the following membrane system is solving a decidability problem. It outputs "yes" if

$$

$$divides

$$

$$and

$"$

no

$"$

$$otherwise$.$

$,$

$$where

$$

$=$

$\{$

$$

$$

$$

$\text{'}$

$$

$,$

$$yes$,$ no