How many days after the five first Cuban rafters left Cuba were they rescued by a fishing boat names the KAL?
return the  first five Cuban rafters left Cuba ;return the  first five Cuban rafters were rescued by a fishing boat names the KAL ;return when  was  #1 ;return when  was  #2 ;return difference of #4 and  #3 in  days
['select', 'select', 'project', 'project', 'arithmetic']