context: A brown, black, and white dog barking up a tree.
hypothesis: It is impossible that dogs are barking up a tree because they noticed a squirel.
valid_hypothesis: There is a better than even chance that dogs are barking up a tree because they noticed a squirel.
invalid_hypothesis: It is impossible that dogs are barking up a tree because they noticed a squirel.
hypothesis_assertion: Dogs are barking up a tree because they noticed a squirel.