A "circle of friends" is a set of (site) members where each member has exactly two "friendship" relations in the whole set
Hmm, I think so - each member can have many "friendships", but the answer will only have two "friendships" per person in the solution (i.e. superfluous friendships will be ignored).
I think this definition fits your description, but I'm not sure. My mental image is of a circle of persons, each holding hands - is that the right image?
Yes, but with some constraints - the first friend in the pathway must not be known to the last friend in the pathway (i.e. I know both of them, but they don't know each other).
Tom Melly, firstname.lastname@example.org
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