No repeated row until you reset
Each valid question row has an independent numbered identity. Drawing samples the remaining rows without replacement using a partial Fisher–Yates shuffle and the browser’s secure random source. Each remaining row has the same chance of being selected at that draw. A batch cannot contain the same row twice, and later draws exclude every row already selected in this round. The input order does not give earlier questions priority. The page does not promise a certified lottery, a learning assessment or a particular sequence on a future visit.