The dog likes the squirrel. The mouse needs the squirrel. The squirrel needs the mouse. If the squirrel sees the mouse and the squirrel sees the dog then the dog needs the mouse. If someone sees the mouse and the mouse likes the squirrel then the mouse sees the dog.
The mouse does not need the squirrel.
@0: The dog likes the squirrel.[(triple1)] The mouse needs the squirrel.[(triple2)] The squirrel needs the mouse.[(triple3)]