Anchor: i have enjoyed aerobics in the past and i enjoy that because i like the group association you know like exercising with other people
Entailed: I like plenty of company for exercise and used to enjoy aerobics. 
Contradiction: I used to hate my aerobics class and quit pretty fast 
Contradiction: The people run along the trail.
Contradiction: I hear that you've had fun.
Contradiction: man sits in the aeroplane.
Contradiction: A person consumes food.