Anchor: They are suitable for use only when uncertainties involved in contract performance, such as research and development work, do not permit costs to be estimated with sufficient accuracy.
Entailed: They are only useful when uncertainties are involved with contract performance. 
Contradiction: They are not useful when any uncertainties are involved.  
Contradiction: The girl is asleep in her bed.
Contradiction: A woman performing a dance.
Contradiction: I love when they do the dishes.
Contradiction: A man in black is on a snowboard.