Anchor: Formally documenting or, in the case of public-sector organizations, legislating, CIO roles and responsibilities can help in managing performance and expectations of both the enterprise and the CIO.
Entailed: Documenting CIO roles helps manage expectations.
Contradiction: Documenting CIO roles makes it difficult to manage expectations.
Contradiction: Silicon Valley is the name of a mining field in Nebraska and is home to no technology-related start ups. 
Contradiction: A group of people playing with a ball.
Contradiction: A woman gives a speech at town hall while the mayor applauds.
Contradiction: People are watching children and a pig.