premise: A man cleaning the park with a dark stripe hat, blue coat and dark blue jeans, with a dog on a leash holding a paper picker, along with a man who has a blue hat, yellow gloves, blue coat, light blue jeans, paper picker and bag. hypothesis: The dog is roaming free.
contradiction: If the dog is roaming free it would be alone and untethered. The dog cannot be on a leash with a man along with another man.