2Thegoalistoestimatethiswithinadditiveerrorofkak2equivalentlywithrelativeerror1withprobabilityatleast1ThesecondfrequencymomentinourmodelisthesquareoftheL2normkak22Thesetwoqueriesappeartobe ID: 169882
2.Thegoalistoestimatethiswithinadditiveerrorof"kak2(equivalently