context: It is certain that Greg is a rhino. It is unlikely that Bernhard is a lion. It is almost certain that Bill dropped the milk. Chances are about even that if either Bill dropped the milk, or Bernhard is a lion, then Sandra took the apple. It is highly likely that if Greg is a rhino, or Bernhard is a lion, then Mary went to the garden. It is almost certain that if Bill dropped the milk, or Greg is a rhino, then Brian is white.
hypothesis: There is little chance that either Sandra took the apple, or Bill dropped the milk.
valid_hypothesis: There is a better than even chance that either Sandra took the apple, or Bill dropped the milk.
invalid_hypothesis: There is little chance that either Sandra took the apple, or Bill dropped the milk.
hypothesis_assertion: Either Sandra took the apple, or Bill dropped the milk.