{"abstract":"Read-only braille cells accept a text routing position.","category":"Accessibility interaction semantics","checks":8,"contract":"Input [cells,offset,width,route] where cells [source_start,source_end,content,editable]. Clip display window by nonnegative offset and width. Each cell has one display position regardless of content length. Routing uses a zero-based position inside displayed cells; return None if outside window or cell not editable, otherwise [source_start,source_end]. Display contents replace empty cell content with a space; protected content (exact token SECRET) displays a bullet. Return [display,source_ranges,route_result,has_previous,has_next]. Source ranges preserve zero-width insertion cells.","evaluation_group":"s3-accessibility-braille-routing","failed_approach":"The local repair substitutes if editable or c: routed = [s,e] but still mishandles the regression fixtures.","family":"s3-accessibility-braille-routing-readonly-routing","id":"FA-54236","implementations":{"attempt":{"sha256":"6236cbb1ac0ce64092b3b6b2dffb2334b9ea2eb7571d25a2c70ae561cc7da276","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(data):\n cells,offset,width,route = data\n offset,width = max(0,offset),max(0,width)\n window = cells[offset:offset+width]\n contents = [('•' if c == 'SECRET' else (c if c else ' ')) for s,e,c,editable in window]\n ranges = [[s,e] for s,e,c,editable in window]\n routed = None\n if 0 <= route < len(window):\n s,e,c,editable = window[route]\n if editable or c: routed = [s,e]\n return [contents,ranges,routed,offset>0,offset+len(window)0,offset+len(window)0,offset+len(window)