See what photos are "collected"?

Is there any way to tell which photos are collected in a gallery?
Actually, I want to know which aren't.
I have a "master" gallery that I've sorted into many Smart galleries using keywords, but I'm worried I might have missed some.
Actually, I want to know which aren't.
I have a "master" gallery that I've sorted into many Smart galleries using keywords, but I'm worried I might have missed some.
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