context: Chances are about even that Julius is a rhino. There is a very good chance that Mary went to the office. There is a very good chance that John picked up the apple. There is almost no chance that if Mary went to the office, and John picked up the apple, then Lily is a lion. We believe that if Julius is a rhino, and Mary went to the office, then Bernhard is a frog. It is probably not the case that if either Julius is a rhino, or John picked up the apple, then Bill is in the school.
hypothesis: There is a very good chance that bill is in the school, or Mary went to the office.
valid_hypothesis: There is a very good chance that bill is in the school, or Mary went to the office.
invalid_hypothesis: Chances are slight that bill is in the school, or Mary went to the office.
hypothesis_assertion: Bill is in the school, or Mary went to the office.