A box named one covers a medium yellow apple. There exists a box named two. To the south of another medium yellow apple is a medium yellow apple. Medium yellow apple number one is in box two. Medium yellow apple number two is in box two. Box two has another medium yellow apple and covers another medium yellow apple. Medium yellow apple number three is to the south of medium yellow apple number one and touches medium yellow apple number four. South of this fruit is medium yellow apple number four.
Are all medium yellow apples covered by any box?