context: It is probably the case that Brian is a rhino. There is little chance that Sandra took the apple. It is certain that Fred left the football. We believe that if Fred left the football, and Brian is a rhino, then Mary moved to the garden. It is impossible that if either Sandra took the apple, or Brian is a rhino, then John went to the office. It is highly unlikely that if Brian is a rhino, and Fred left the football, then Greg is white.
hypothesis: Chances are about even that mary moved to the garden, or John went to the office.
valid_hypothesis: Chances are about even that mary moved to the garden, or John went to the office.
invalid_hypothesis: It is certain that mary moved to the garden, or John went to the office.
hypothesis_assertion: Mary moved to the garden, or John went to the office.