How did the Eldar indicate possession in Tengwar?

[Halasían]

I had learned to write Tengwar back in the 70's, and am again getting back into it. Back then, I had the Appendix E, now there seems to be a few sites on the internet to assist.
I've been looking at Amanye Tenceli a lot and comparing to notes I made back in the day.

I would be curious if there was a consensus on how one would write 'friends' .