Joff must kill B OR R : And if he doesn't kill R, he must kill B. (B or R = If NOT B, then R.)
#feedback maybe there could be examples for each of these types one more time. Just to help reinforce the ideas.
Are you sure?
Joff must kill B OR R : And if he doesn't kill R, he must kill B. (B or R = If NOT B, then R.)