context: It is highly unlikely that Mary dropped the milk. It is impossible that John went to the hallway. There is little chance that Winona is a mouse. Chances are about even that if John went to the hallway, or Mary dropped the milk, then Bernhard is a rhino. It is impossible that if either John went to the hallway, or Winona is a mouse, then Julius is a frog. Chances are slight that if John went to the hallway, or Mary dropped the milk, then Jessica is a mouse.
hypothesis: There is a very good chance that either Mary dropped the milk, or Jessica is a mouse.
valid_hypothesis: It is highly unlikely that either Mary dropped the milk, or Jessica is a mouse.
invalid_hypothesis: There is a very good chance that either Mary dropped the milk, or Jessica is a mouse.
hypothesis_assertion: Either Mary dropped the milk, or Jessica is a mouse.