JavaScript Can a Model in Ampersand.js (or Backbone.js) be in multiple Collections simultaneously?

Basically, I want to know if Collections work more like folders (they “physically contain” Models), or playlists (they contain a reference to Models).

If they work like folders, is there a convention for emulating the playlist functionality?

FWIW, I’m not modeling playlists — I’m just using them as a metaphor.
I found several questions with titles that appeared to be similar to this question. But when I investigated, I couldn’t find a clear answer to my question.

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