What event happened first, the annual convention in San Francisco, or the AFL expelling the CIO and its million members?
return the  annual convention in  San Francisco ;return the  AFL expelling the   CIO and  its million members ;return when  was  #1 ;return when  was  #2 ;return which is lowest of #3 ,  #4
['select', 'select', 'project', 'project', 'comparison']