Chances are about even that Mary discarded the milk. It is highly likely that Lily is a frog. Chances are slight that Brian is a swan. It is highly unlikely that if Brian is a swan, and Lily is a frog, then John moved to the office. It is probable that if Brian is a swan, and Lily is a frog, then Fred went to the kitchen. Chances are slight that if Mary discarded the milk, or Brian is a swan, then Greg is yellow.
It is certain that mary discarded the milk, or Fred went to the kitchen.
Chances are about even that mary discarded the milk, or Fred went to the kitchen.
It is certain that mary discarded the milk, or Fred went to the kitchen.
Mary discarded the milk, or Fred went to the kitchen.