Joseph T. answered 04/04/20
Former Math Olympiad Participant With International Experience
Bo is in chair 3 and is adjacent to Fe on one long side, therefore Fe is sitting in chair 2.
So far, Fe is in chair 2, across is Al in chair 6, Bo is in chair 3, and Ed in chair 1 or 4.
Al is across Fe
Bo and Ed are not across one another, so Bo is across Jo or Vi.
So Jo and Vi cannot sit across each other.
e.Vi and Jo