Anchor: Many centers also offer an introductory session commonly known as the Discover SCUBA Program. 
Entailed: The Discover SCUBA Program helps beginners.
Contradiction: You must be an experienced diver before coming here.
Contradiction: Someone is standing on a bare mattress.
Contradiction: A canine is outside in the winter sitting next to a toy.
Contradiction: The woman is young.
Contradiction: Something might come from the autopsy.