Anchor: Somewhere there is a young lady whose life has been impoverished by my failure to sire the son who would someday sweep her off her feet.
Entailed: Because I don't have a son, some woman out there is missing out.
Contradiction: Women out there are much better off because I don't have a son.
Contradiction: This is english
Contradiction: It may succeed in selling that argument even if it is not.
Contradiction: The students are standing on the bus.
Contradiction: The climber is on a rock.