Size Duel deck / Sport, food and everyday things
A4 sheet of paper
Sources and checks
Checked 2026-11-01: Researched by Codex (two independent publishers, verbatim quotes); every counted quote re-found on its page by the server check (content-verify, or content-verify-pdf for PDFs); scope and plausibility reviewed by Claude (AI build agent). Quotes are short passages from each source.
“297 mm x 210 mm”Canon: source, retrieved 2026-10-27; quote found in the PDF’s text by content-verify-pdf
“210 × 297 mm”Epson: source, retrieved 2026-10-27; quote re-found by the server check
Spotted a mistake? Tell us; a correction gets a new revision.