We doubt that John put down the milk. It is probable that Bernhard is a frog. It is highly unlikely that Fred is in the park. It is almost certain that if John put down the milk, or Bernhard is a frog, then Brian is a rhino. Chances are slight that if Fred is in the park, or Bernhard is a frog, then Julius is green. Chances are about even that if John put down the milk, or Fred is in the park, then Greg is green.
It is impossible that greg is green, and Julius is green.
It is impossible that greg is green, and Julius is green.
It is certain that greg is green, and Julius is green.
Greg is green, and Julius is green.