context: We doubt that Greg is a frog. It is probably the case that John put down the apple. It is likely that Emily is a mouse. It is likely that if John put down the apple, and Emily is a mouse, then Fred left the football. It is certain that if Emily is a mouse, or Greg is a frog, then Julius is a swan. It is probably not the case that if Greg is a frog, and John put down the apple, then Brian is a frog.
hypothesis: It is improbable that julius is a swan, or Greg is a frog.
valid_hypothesis: We believe that julius is a swan, or Greg is a frog.
invalid_hypothesis: It is improbable that julius is a swan, or Greg is a frog.
hypothesis_assertion: Julius is a swan, or Greg is a frog.