Anchor: In one such study, GGD examined whether national policies, procedures, and practices with regard to cargo imports were causing problems in port operations (U.S.
Entailed: GGD examined whether national policies were causing problems in port operations.
Contradiction: In one study, GGD chose to examine whether a local policy could cause problems with port operations.
Contradiction: This two volume set is the sole effort of GAO. 
Contradiction: Mazzariello wanted to give something back to the community.
Contradiction: The gymnast is sitting out.
Contradiction: A boy is injured.