I easily spotted the difference, but the article says “a black lentil in the lower left area has been removed”, and I couldn’t see the removal. Maybe they mean

I easily spotted the difference, but the article says “a black lentil in the lower left area has been removed”, and I couldn’t see the removal. Maybe they meant “a black lentil in the lower left area has been moved, thereby moving another lentil a little bit”? (Seems an easier demonstration to me. Removing a single lentil is trickier than moving one a tiny bit)