context: There is a better than even chance that Greg is a swan. It is probably not the case that Bernhard is a rhino. There is little chance that Sandra dropped the apple. It is highly unlikely that if Sandra dropped the apple, and Greg is a swan, then Julius is a frog. Chances are about even that if Sandra dropped the apple, or Greg is a swan, then Bill left the milk. It is probably not the case that if Greg is a swan, or Bernhard is a rhino, then Mary went to the garden.
hypothesis: There is little chance that bill left the milk, and Mary went to the garden.
valid_hypothesis: There is little chance that bill left the milk, and Mary went to the garden.
invalid_hypothesis: It is probable that bill left the milk, and Mary went to the garden.
hypothesis_assertion: Bill left the milk, and Mary went to the garden.