Synesthesia? Perhaps her brain sees those sets and identifies them in such a way that it takes no conscious effort? A group might appear in a different color, o

Synesthesia? Perhaps her brain sees those sets and identifies them in such a way that it takes no conscious effort? A group might appear in a different color, or "taste" or feeling, for example... https://en.wikipedia.org/wiki/Synesthesia https://en.wikipedia.org/wiki/Synesthesia