Which happened first, the formation of the Somali Salvation Democratic Front, or the defeat of the rebels?
return the  formation of the   Somali Salvation Democratic Front ;return the  defeat of the   rebels ;return when  was  #1 ;return when  was  #2 ;return which is the  lowest of #3 ,  #4
['select', 'select', 'project', 'project', 'comparison']