premise: An African-American male youth is riding a green bicycle while other people are looking at pictures on a board. hypothesis: A boy is walking on a sidewalk in his neighborhood.
contradiction: A boy riding a bicycle cannot be walking on a sidewalk the same time.|contradiction: RIDING A BICYCLE IS DIFFERENT FROM WALKING ON A SIDEWALK.|contradiction: An African-American male youth is not the same as a boy. Boy cannot be walking and riding at same time.