{"input":[[3,2,3]],"expected":3,"label":"Classic: 3 appears 2/3 → majority"}
{"input":[[2,2,1,1,1,2,2]],"expected":2,"label":"2 appears 4/7 → majority"}
{"input":[[6,6,6,7,7,7,7]],"expected":7,"label":"7 appears 4/7 → majority"}
