What are the names and ages of every person who is a friend of both Dan and Alice?
return people ;return #1 who are friends with  Dan ;return #1 who are friends with  Alice ;return #1 in both #2 and #3 ;return names of #4 ;return ages of #4 ;return #5 ,  #6
['select', 'filter', 'filter', 'intersection', 'project', 'project', 'union']