Anchor: Although a number of uncertainties remain to be addressed by continued research (NRC, 1998), a substantial body of published scientific literature recognizes a correlation between elevated PM concentrations and increased mortality rates.
Entailed: There is still research being conducted.
Contradiction: The research has been completed.
Contradiction: May we discuss something unrelated to exercise?
Contradiction: The identification of configuration. 
Contradiction: I want them to stay and am asking you to.
Contradiction: Past presidents have been chiming in on how they feel about policies