Favorite multiple stars?

Lately I've been enjoying trying to find pretty multiple stars, like
the famous "double double" of epsilon Lyrae. While I enjoy a pretty
double, for some reason I find multiples more interesting. Does anyone
know of a resource for good viewing candidates?

What are your favorite multiples?

Also, what's the crossoever point from "multiple star system" to "small
cluster"?

-Mark

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