Anchor: A key reason that screening is not performed is the widely held perception that treatment is not effective.
Entailed: A key reason that screening doesn't happen is the perception that treatment doesn't work.
Contradiction: A key reason that screening doesn't happen is the perception that treatment is the only route.
Contradiction: The Arc de Triomphe du Carrousel was built decades apart from its bigger brother at l'Etoile.
Contradiction: A man runs.
Contradiction: They are everywhere. 
Contradiction: a group gathers to watch some tricks