Anchor: But as with life on Mars, until you get a chance to take a look, how confident can you be one way or another?
Entailed: You can't be confident one way or another until you get a chance to look. 
Contradiction: You can be 100% sure whether or not you look. 
Contradiction: A group of men are playing basketball.
Contradiction: Smith's law people took 6,352 hours to regain the Pittsburgh archive.
Contradiction: Happy Halloween!
Contradiction: His boots went up to the knee.