Anchor: Among the most important work that GAO has done are reviews related to the Year 2000 (Y2K) computing challenge.
Entailed: The Y2K computing challenge reviews are some of the most important work conducted by the GAO.
Contradiction: The GAO has never done any reviews in relationship to the Year 2000 (Y2K).
Contradiction: Several teens are shopping for music at the record store.
Contradiction: A couple dances.
Contradiction: A tuba player cleans his instrument.
Contradiction: Dogs playing in winter weather