Anchor: Contributors need only be able to use Internet browsers and basic word processing and email programs, Colpoys said.
Entailed: Word processing, email, and internet browsers are all people need to contribute.
Contradiction: Contributors need extensive training to be able to help.
Contradiction: It was a terrible idea!
Contradiction: He had gotten electrical components. 
Contradiction: He left his rifle on the wall.
Contradiction: This issue is challenging for Amar.