What is the average number of cities of markets with low film market estimate bigger than 10000?
return markets ;return low film market estimates of #1 ;return #1 where #2 is higher than 10000 ;return cities of #3 ;return number of  #4 for each #3 ;return the  average of #5
['select', 'project', 'comparative', 'project', 'group', 'aggregate']