context: Chances are slight that Brian is a frog. Chances are slight that Emily is a mouse. It is highly likely that Jeff went to the kitchen. It is probably not the case that if Emily is a mouse, or Jeff went to the kitchen, then Julius is a lion. It is likely that if Emily is a mouse, or Brian is a frog, then Bernhard is a lion. Chances are about even that if Jeff went to the kitchen, and Brian is a frog, then Mary moved to the garden.
hypothesis: Chances are slight that jeff went to the kitchen, or Brian is a frog.
valid_hypothesis: It is highly likely that jeff went to the kitchen, or Brian is a frog.
invalid_hypothesis: Chances are slight that jeff went to the kitchen, or Brian is a frog.
hypothesis_assertion: Jeff went to the kitchen, or Brian is a frog.