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x:=Input("number of periods for APE",2,200,25);
ax:= Max( Abs(HHV(H, x) - Ref(O, -(x-1))), Abs(LLV(L, x) - Ref(O, -(x-1))) );
a1:= Max( Abs(H - O), Abs(L - O) );
Log( ax / a1 ) / Log( x )