context: It is highly likely that Sandra got the football. It is certain that Lily is a frog. It is improbable that Antoine is bored. It is highly likely that if Lily is a frog, and Antoine is bored, then Daniel took the apple. It is improbable that if either Sandra got the football, or Lily is a frog, then Mary dropped the apple. It is likely that if Sandra got the football, or Lily is a frog, then Brian is yellow.
hypothesis: It is probably not the case that either Brian is yellow, or Sandra got the football.
valid_hypothesis: It is probably not the case that either Brian is yellow, or Sandra got the football.
invalid_hypothesis: It is highly likely that either Brian is yellow, or Sandra got the football.
hypothesis_assertion: Either Brian is yellow, or Sandra got the football.