Anchor: A less obvious factor fostering residential segregation is the boundary between city and suburb.
Entailed: the boundary between the city and suburb is a factor in fostering residential segregation. 
Contradiction: the boundary between the city and suburb is perfectly obvious factor fostering residential segregation. 
Contradiction: Harvey Keitel has always been fully clothed in movies.
Contradiction: Two boys are have shorts on
Contradiction: Two football players preparing to hike a tennis ball.
Contradiction: The window is dirty.