query: SELECT country FROM stadium EXCEPT SELECT country FROM stadium WHERE opening_year  >  2006
question: Which countries do not after 2006 have the stadium that have been opened it?
query_toks: SELECT country FROM stadium EXCEPT SELECT country FROM stadium WHERE opening_year > 2006
query_toks_no_value: select country from stadium except select country from stadium where opening_year > value
question_toks: Which countries do not after 2006 have the stadium that have been opened it?