Give me a list of cities whose temperature in Feb is higher than that in Jun or cities that were once host cities?
return cities   ;return #1 that  were once host cities   ;return temperatures of #1 ;return #3 in Feb ;return #3 in Jun ;return #1 where #4 is  higher than #5 ;return #6 ,  #2
['select', 'filter', 'project', 'filter', 'filter', 'comparative', 'union']