Anchor: An additional observatory was added in the 1820s, but the smoky skies and train steam over the city at that time made it an unsuitable location for watching the stars.
Entailed: There was smoke and steam in the skies over the city in the 1820s.
Contradiction: The observatory built in the 1820s was the best place to see the stars.
Contradiction: The observatory was a suitable location for stargazing because the air was so clean.
Contradiction: A shirt carries a jacket down the street.
Contradiction: there is a happy child
Contradiction: The first plane hit the north tower at 9:03 that evening.