question: Show the countries that have both managers of age above 50 and managers of age below 46.
#1 return managers  
#2 return ages of #1 
#3 return #1 where #2 is  above 50 
#4 return #1 where #2 is  below 46 
#5 return the  countries of #3 
#6 return the  countries of #4 
#7 return the  countries in both #5 and #6