What are the titles of films that are either longer than 100 minutes or rated PG other than those that cost more than 200 to replace?
return films ;return #1 that are longer than 100 minutes ;return #1 that are rated PG ;return #2 ,  #3 ;return #4 that cost higher than 200 to replace ;return #4 besides  #5 ;return titles of #6
['select', 'filter', 'filter', 'union', 'filter', 'discard', 'project']