context: Chances are slight that John took the apple. It is probably not the case that Mary went to the hallway. It is likely that Emily is a sheep. Chances are slight that if Emily is a sheep, or John took the apple, then Winona is a mouse. It is probably the case that if Emily is a sheep, or John took the apple, then Brian is a rhino. It is probably not the case that if Mary went to the hallway, or Emily is a sheep, then Lily is a frog.
hypothesis: Chances are about even that emily is a sheep, and Brian is a rhino.
valid_hypothesis: Chances are about even that emily is a sheep, and Brian is a rhino.
invalid_hypothesis: It is certain that emily is a sheep, and Brian is a rhino.
hypothesis_assertion: Emily is a sheep, and Brian is a rhino.