Anchor: it's usually not a one time accidental thing i don't think
Entailed: It is normally not a one time mistake.
Contradiction: I think it is always a one time slip-up.
Contradiction: A woman skis.
Contradiction: The body has some initial bone-building response to large doses of calcium.
Contradiction: Four girls are running on a track.
Contradiction: A group of people are together near a surface.