Which event happened first, Negotiations between Germans and Partisans or the Bulgarian 1st Army occupied south-west Serbia?
return Negotiations between Germans and  Partisans ;return the  Bulgarian 1st Army occupied south-west Serbia ;return when  was  #1 ;return when  was  #2 ;return which is lowest of #3 ,  #4
['select', 'select', 'project', 'project', 'comparison']