Anchor: a 801(a)(3) required that it take effect no earlier than May 13, 1997.
Entailed: The regulation stated it had to take effect after May 12, 1997.
Contradiction: It could start at any time.
Contradiction: A man is napping.
Contradiction: I'm in favor of either concealed or unconcealed. 
Contradiction: It is snowing outside.
Contradiction: Somebody received a present