The cow does not see the mouse. The mouse does not see the cow. If something chases the cow and the cow is nice then it needs the cow. If the mouse sees the cow then the cow does not chase the mouse. If something is red then it sees the mouse. If the mouse sees the cow then the mouse is round. If something sees the mouse and the mouse sees the cow then it chases the cow. If something needs the mouse and the mouse chases the cow then the cow is blue. If the mouse chases the cow and the mouse does not need the cow then the mouse sees the cow. If the mouse is red and something does not see the mouse then the mouse does not chase the cow.
The mouse does not need the cow.