How many years are treated in detail in contemporaneous sagas: Sverris saga, the Bagler sagas, and Håkon Håkonsson's saga?
return the  Sverris saga  ;return the  Bagler sagas  ;return the  Håkon Håkonsson saga  ;return years treated in  detail of #1 ;return years treated in  detail of #2 ;return years treated in  detail of #3 ;return number of  #4 ;return number of  #5 ;return number of  #6 ;return sum of #7 ,  #8 ,   #9
['select', 'select', 'select', 'project', 'project', 'project', 'aggregate', 'aggregate', 'aggregate', 'arithmetic']