Anchor: According to GSA officials, GSA considered establishing a frequent traveler program in the early 1990s but abandoned the idea because the airlines would neither pool the miles received by GSA employees for the agency's use nor provide data to GSA on the miles its employees received.
Entailed: GSA nearly made a frequent traveler program in the early 90's. 
Contradiction: The frequent traveler program came into effect in 1992. 
Contradiction: The street vendor is selling ice cream.
Contradiction: A dog is jumping up.
Contradiction: they hated each other
Contradiction: Two dogs are in the snow