context: It is probably the case that Brian is a rhino. It is unlikely that Julius is a swan. It is improbable that Mary left the football.
hypothesis: It is certain that julius is a swan, and Mary left the football.
valid_hypothesis: There is almost no chance that julius is a swan, and Mary left the football.
invalid_hypothesis: It is certain that julius is a swan, and Mary left the football.
hypothesis_assertion: Julius is a swan, and Mary left the football.