Generate a set of surface-code decoding puzzles for a classroom. Each question shows an
injected error and a named decoder; students predict whether the code is fixed or an
error gets through. Every answer is the real outcome computed by the same
evaluateCorrection the interactive tool uses. Set your options, then use your
browser's Print (Ctrl/Cmd+P) to save a PDF, the answer key is on the last page.
classroom-1 gets the identical sheet.
Change the seed to make a fresh set; keep it to reprint the same one.