Anchor: During the events of May 1968, students used it as a factory for militant posters.
Entailed: In May 1968, students were involved in making militant posters. 
Contradiction: The students used the location to make posters in June 1956.
Contradiction: When the weather is nice, it is much preferable to have a picnic.
Contradiction: The site is now occupied by a chapel, the foundation might be a century old at the very least.
Contradiction: You cannot get a trial for anything at all.  
Contradiction: Dogs running outdoors.