Anchor: A barrel of water can collapse a tunnel or eat away one of the pillars.
Entailed: A tunnel could be collapsed by a barrel of water. 
Contradiction: Water is not strong enough to collapse a tunnel. 
Contradiction: a man walking naked
Contradiction: A seamstress wearing purple finished sewing a pattern on cloth
Contradiction: Nothing that the postal operator can do will affect the postal density. 
Contradiction: A sidewalk has a view of a traffic intersection.