context: It is improbable that Fred moved to the office. There is a very good chance that Mary went to the kitchen. We doubt that Sandra dropped the milk. It is improbable that if either Mary went to the kitchen, or Sandra dropped the milk, then Gertrude is a mouse. We doubt that if either Mary went to the kitchen, or Fred moved to the office, then Brian is a frog. It is highly unlikely that if either Mary went to the kitchen, or Fred moved to the office, then Lily is white.
hypothesis: It is unlikely that brian is a frog, or Lily is white.
valid_hypothesis: It is unlikely that brian is a frog, or Lily is white.
invalid_hypothesis: It is probably the case that brian is a frog, or Lily is white.
hypothesis_assertion: Brian is a frog, or Lily is white.