For supplementary essays, can I reuse ECs that appear in my activities section? Or should I opt for ECs that haven’t appeared anywhere yet? I would like to write about my most time consuming ECs (as they are what I was most dedicated to and best explain me) but I’ve heard people say to avoid listing/mentioning ECs more than once, especially elaborating on an EC that already has appeared elsewhere since the essays are supposed to teach something the colleges didn’t know about you, not something that has already once appeared.