question: Name the total number of average for wickets more than 537, career of 1899/00-1925/26 and matches less than 211
answer: SELECT COUNT(average) FROM table_name_21 WHERE wickets > 537 AND career = "1899/00-1925/26" AND matches < 211
context: CREATE TABLE table_name_21 (average VARCHAR, matches VARCHAR, wickets VARCHAR, career VARCHAR)