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j=kโNโaj=1โaakโaN+1โ
ย ifย โฃaโฃ<1,ย j=kโโโaj=Nโโlimโj=kโNโaj=1โaakโ
j=1โโโaj=1โaaโ
j=0โโโaj=1โaaโ
j=1โโโjaj=(1โa)2aโ
j=0โโโjaj=(1โa)2aโ
j=1โโโj2aj=(1โa)2a+a2โ
j=0โโโj2aj=(1โa)2a+a2โ