context: Chances are slight that Sandra took the football. Chances are slight that John went to the hallway. It is probably not the case that Yann is thirsty. There is a better than even chance that if Sandra took the football, or Yann is thirsty, then Julius is a swan. It is likely that if either Yann is thirsty, or John went to the hallway, then Emily is a sheep. It is probably the case that if Sandra took the football, and John went to the hallway, then Mary left the milk.
hypothesis: It is almost certain that julius is a swan, and Yann is thirsty.
valid_hypothesis: It is improbable that julius is a swan, and Yann is thirsty.
invalid_hypothesis: It is almost certain that julius is a swan, and Yann is thirsty.
hypothesis_assertion: Julius is a swan, and Yann is thirsty.