Everything I can find on FB docs showcases a single key per side scenario. After I inspect usage of the secret chat, I can only speculate it is build on top of the existing message exchange. The key exchange is just an additional key or index so FB can remove those message from the server.
The key icon in Facebook Messenger indicates end-to-end encryption in secret conversations, ensuring message privacy. If you see this icon, your chat is secured and only visible to you and the recipient.
Device keys Facebook Messenger: Am I in a secret ... - JustAnswer
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Interior Alaskan forests have only six native tree species: white spruce, black spruce, quaking aspen, balsam poplar, larch (tamarack) and paper birch. Northern Canadian forests have all of those, plus jack pine, balsam fir and lodgepole pine. Since northern Canada and interior Alaska share the same grueling climate and extremes of daylength, why are the Canadian tree species absent from ...
It is common for people in interior Alaska and corresponding areas of northwestern Canada to use the name cottonwood when referring to one widespread variety of deciduous tree.
A tree's age can be easily determined by counting its growth rings, as any Boy or Girl Scout knows. Annually, the tree adds new layers of wood which thicken during the growing season and thin during the winter. These annual growth rings are easily discernible (and countable) in cross-sections of the tree's trunk. In good growing years, when sunlight and rainfall are plentiful, the growth rings ...