Finding Photos That Do Not Have Faces Data Assigned To Them

Is there a way to put all the photos that have not faces data assigned to them and put them into a folder so I can more easily go through and assign faces. My photo library is big (25000+ photos) and I’m trying to add faces to all photos that I can. Going through each photo to see if it already has faces data attached to it is taking a long time. Any other hints to quickly add faces to photos.
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Steve