Anchor: He thought a successful multi-center trial could lead to the creation of a standard of care.
Entailed: He thought a trial could help create a standard of care.
Contradiction: He thought trials weren't goign to help them develop a standard of care.
Contradiction: We have started to make our performance appraisal system weaker. 
Contradiction: Two people are wearing diving gear.
Contradiction: Two girls are getting books out of their lockers.
Contradiction: I can walk but only for a limited amount of time before it bothers me.