Anchor: Could he turn it by degrees so gently and imperceptibly that those in the room would notice nothing? 
Entailed: Could it be done in a way so minor that nobody would notice?
Contradiction: Could he turn it quickly enough to get away?
Contradiction: A man is snowboarding.
Contradiction: It's hard to know how much national saving will increase.
Contradiction: Tommy is by himself.
Contradiction: A group of people sit outside.