Did the Romanian army cross the Tisza river before or after the Hungarian army retreated towards Budapest?
return the  Romanian army crosses the   Tisza river ;return the  Hungarian army retreated towards Budapest ;return when  was  #1 ;return when  was  #2 ;return if #3 is lower than #4 ;return if #3 is higher than #4 ;return which is true of #5 ,  #6
['select', 'select', 'project', 'project', 'boolean', 'boolean', 'comparison']