find the id, name and age for visitors who visited some museums more than once.
return visitors ;return museums #1 visited ;return number of  #2 for each #1 ;return #1 where #3 is  more than  one ;return the  ids of #4 ;return the  names of #4 ;return the  ages of #4 ;return #5 ,  #6 ,   #7
['select', 'project', 'group', 'comparative', 'project', 'project', 'project', 'union']