Which staff have contacted which engineers? List the staff name and the engineer first name and last name.
return staff  ;return #1 who contacted engineers ;return staff  name of #2 ;return engineer contacted of #2 ;return first name of #4 ;return last name of #4 ;return #3 ,  #5 ,   #6
['select', 'filter', 'project', 'project', 'project', 'project', 'union']