The cow sees the squirrel. The mouse needs the squirrel. The squirrel needs the mouse. If something is blue and green then it sees the squirrel. If the mouse chases the squirrel then the mouse needs the squirrel. If something needs the squirrel and it is big then it is red. If something needs the squirrel and the squirrel is green then the squirrel is big. If something is big then it needs the mouse. If something sees the mouse and the mouse sees the cow then the cow needs the squirrel. If something is big then it is red. If something chases the mouse then it needs the cow.
The squirrel does not need the mouse.