Anchor: The cumulative case study can be retrospective, aggregating information across studies done in the past, or prospective, structuring a series of investigations for different times in the future.
Entailed: The study can be retrospective. 
Contradiction: This is the first study.
Contradiction: Children are playing video games.
Contradiction: Two men are playing a sport.
Contradiction: The old man is eating pudding.
Contradiction: Hanson's body was twisting and turning.