Anchor: This eerie lake, shimmering in the heat, is so heavy with salt and other minerals that nothing lives in its waters; swimmers find it almost impossible to sink or even to submerge themselves.
Entailed: The salinity of the lake is extremely high that swimmers aren't able to sink in it.
Contradiction: People aren't sinking in that lake because it's shallow.
Contradiction: Tommy is not stony.
Contradiction: There is one boy in this picture.
Contradiction: the man is riding the train
Contradiction: A dog is walking up snowy steps.