How do I pick up some objects to destroy?

I create 15 objects from 1 sprite, each one of them has an instance variable named "ob" with these values 0,1,2,...,15. I want to destroy some objects.

I tried:

compare instance variable :: destroy

but all objects will be destroyed, I only want to destroy some objects, not all. How Do I Do That?

file capx https://drive.google.com/uc?export=download&id=0B8g2b8f9ktNBRnpHS3J3aVp1MG8

replace Compare two values with Pick by comparison

replace Compare two values with Pick by comparison

I got it, Thank you very much !