Anchor: A choir is singing in a park.
Entailed: A group of people in a park sing together.
Contradiction: People sing Christmas carols in a theater.
Contradiction: There were reports of the solution causing side effects. 
Contradiction: LSC is producing a listing of draft characteristics of ideal telephone intake, referral, and advice systems, as a part of its effort to encourage and promote innovative procedures.
Contradiction: there is no choice to be made for the analysis
Contradiction: two men in hard hats and bright work shirts are working hard