ABCDEFG

Never get suckered into the ABCDEFG situation.

Let me explain what I mean by that. I have made this mistake in the past, say I want to plan an event and invite a group of people -- ABCDEFG -- to join. All of a sudden this turned into a GRE analytical problem: A will not go if D will be there, and E will not go if G will be there, but if I invite C, I will have to invite D???

The best solution, in my opinion, is: don't try to sort it out. Invite them all, and let them figure out who doesn't want to join. Never get suckered into the situation when you are the one deciding who to or not to invite.