Anchor: From time to time, he frowned, as if the sight of the sky was making him wonder.
Entailed: He kept frowning, as if the sky was making him wonder.
Contradiction: He kept laughing from time to time, as if there was something funny in the sky.
Contradiction: A person is riding a stolen unicycle is being chased by a large group unicyclers.
Contradiction: A dog batting a white ball.
Contradiction: Hagia Sophia has been used as a mosque since 1935.
Contradiction: The Fourth Crusade was partially inspired by Venice's jealousy of Byzantium's trading power.