Anchor: Thus, even if GAO were able to identify certain deficiencies in a land management plan, for example, GAO would be prohibited from examining the process used to develop the plan in order to suggest improvements.
Entailed: Thus, if the GAO were able to identify deficiencies in the land management plan, for example GAO would be prohibited from examining the process used to develop the plan in order to suggest improvements. 
Contradiction: Thus, if the GAO were not able to identify deficiencies in the land management plant, for example GAO would be prohibited from examining the process used to develop the plan in order to suggest improvements. 
Contradiction: You can't use any of the threads.
Contradiction: It is to warm to be outside.
Contradiction: the people are standing
Contradiction: The airplane was taking off.