if you look at the images in this particular patent of theirs, I think it helps understand what you're asking about: https://patentimages.storage.googleapis.com

if you look at the images in this particular patent of theirs, I think it helps understand what you're asking about: https://patentimages.storage.googleapis.com/93/1e/5d/6ad89e2c16c06b/US20210183739A1.pdf https://patentimages.storage.googleapis.com/93/1e/5d/6ad89e2... Hope that helps!