It is improbable that Sandra left the apple. It is certain that Bernhard is a swan. It is certain that Lily is a frog.
Chances are slight that either Lily is a frog, or Sandra left the apple.
It is highly likely that either Lily is a frog, or Sandra left the apple.
Chances are slight that either Lily is a frog, or Sandra left the apple.
Either Lily is a frog, or Sandra left the apple.