list all round trip flights from indianapolis to orlando departing either on december twenty seventh or on december twenty eighth 
return flights ;return #1 that  are round trip ;return #2 from  indianapolis ;return #3 to orlando ;return #4 departing december twenty  seventh ;return #4 depart december twenty  eighth ;return #5 , #6
['select', 'filter', 'filter', 'filter', 'filter', 'filter', 'union']