[zirkonit]

> Among those people, there’s either a group of three who all know each other, or a group of three who have never met.

Or a group of three who have never met. In your example, B, F and D have never met.

[bena]

That's true. I got caught up in the first half of it.

It would be significantly harder to make a ring of six.

[verst]

Even in a ring of six 3 have never met. :)

[bena]

See, even now, knowing I'm not thinking about the negative result, I'm forgetting the negative result.