Anchor: But its greatness was linked to its fine natural harbour, and when this silted up in the third century a.d. the city went into decline.
Entailed: When the excellent natural harbour became too silty to use, the city started to decline.
Contradiction: The city's greatest strength was its position on top of a hill, which made it difficult to attack.
Contradiction: boy plays piano
Contradiction: A construction worker is at his current job.
Contradiction: The Palacio de Cristal had to be demolished recently.
Contradiction: the guys come from the concert