Anchor: These cranes are necessary to lift heavy pieces (sometimes over 100 tons) several hundred feet and are not needed for all projects.
Entailed: The cranes can lift objects over 100 feet in the air. 
Contradiction: All projects use cranes at some point during construction. 
Contradiction: the man is standing playing the cello
Contradiction: A woman standing by a door
Contradiction: An older woman holds a sign advertising tattoos.
Contradiction: The sun is out.