Anchor: Suppose Shepard is right that we are understating productivity growth by, say, 1 percent.
Entailed: Shepard is correct that our productivity growth is higher than we say.
Contradiction: Shepard is correct that our productivity growth is lower than we say.
Contradiction: A woman is taking a shower.
Contradiction: If the discount is not offered, the benefit will not be realized.
Contradiction: I'm deaf. 
Contradiction: Competitive grant contracts are kept in an electronic archive by EGAL.