Have you already created your persons from 00-99?
They can be any persons;
Friends | Family | Neighbours | Doctors | Teachers | Shopkeepers | Bank Workers | Footballers | Movie Stars | Music Idols | Rich People | Politicians | Presidents | Skilled Workers | Kings & Queens | etc…
Each person is different. Each have different jobs. Each have their own hairstyle, eyebrows and eyes, nose, chin and other facial muscles. Also, each person has their own distinguishing clothing style, shirts, jumpers, trousers, skirts, dresses, shoes and other accessories.
So it’s always easy to separate one person from the other.
You just need to really get to know that person and have at least one single image of him or her standing. And practice imagining the person mentally for all your persons.