Find the name and position of physicians who prescribe some medication whose brand is X?
return medications ;return brands of  #1 ;return #1 where  brand is  X ;return physicians who  prescribe #3 ;return names of  #4 ;return positions of  #4 ;return #5 ,   #6
['select', 'project', 'filter', 'project', 'project', 'project', 'union']