Anchor: Each dive center is registered by the Greek government, and qualified to offer training for novice divers and supervision for qualified divers.
Entailed: Every dive center has to register with the Greek government and is certified to give training.
Contradiction: The Greek government is not concerned with diving and does not register dive centers.
Contradiction: two cyclists pass a finish line
Contradiction: The workers are putting a hole in the wood.
Contradiction: You don't sound athletic at all. 
Contradiction: Man jumps from structure.