Anchor: yeah from what i've read most people in the United States do do some type of volunteer work at some time in their lives
Entailed: From my understanding, the majority of people in the USA have volunteered at one time or another. 
Contradiction: Most people in the US have not done any type of volunteer work before. 
Contradiction: A biker is riding through a city.
Contradiction: I went to the store to get a can crusher for the wall.
Contradiction: Children standing at a hot dog stand in the market.
Contradiction: A masked lady with hair.