Table schema:
CREATE TABLE table_name_70 (wins INTEGER, ties VARCHAR, losses VARCHAR, years VARCHAR)

Question: What is the average number of wins for the person who coached from 1951 to 1956 and had less than 174 losses and less than 6 ties?
SQL: SELECT AVG(wins) FROM table_name_70 WHERE losses < 174 AND years = "1951 to 1956" AND ties < 6