Anchor: For learning to windsurf (boardsail), choose somewhere with plenty of shallow water (such as Ses Salines on Menorca).
Entailed: Beginners should not windsurf in deep water. 
Contradiction: Windsurfing doesn't require any skills beyond grabbing a board and heading into the water. 
Contradiction: The computer was silent.
Contradiction: There is a girl on the beach.
Contradiction: Nobody left Egypt during evacuations and they all stayed home.
Contradiction: William McHugh exposed his genitals.