Where did the immigrants arrive first, Salina Cruz or Coatzacoalcos?
return the  immigrants did arrive in  Salina Cruz ;return the  immigrants did arrive in  Coatzacoalcos ;return when  was  #1 ;return when  was  #2 ;return which is lowest of #3 ,  #4
['select', 'select', 'project', 'project', 'comparison']