Anchor: A dog with a Frisbee in its mouth is running through snow.
Entailed: An animal is running through snow.
Contradiction: A dog is running around on a sunny day.
Contradiction: Rita thinks that nothing is funny and never makes any sort of attempt at humor. 
Contradiction: Despite efforts to achieve its goals, outside influence can still cause it to fail.
Contradiction: Nobody is looking.
Contradiction: Case studies are very intricate procedures delving into immense depth.