Frustrated, Marcelo almost closed it. Then he noticed the metadata: Author: R1. Comment: "Answer is the path."
Not an answer key. A password.
That night, Marcelo found a link in a forgotten forum. The title was exactly: livro r1 psicotécnico gabarito pdf
He solved it. The last row's pattern read, in binary-like symbols: D – R – 1 – X Frustrated, Marcelo almost closed it