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\begin{Example}  Consider the function $f:(\Fb)^3 \rightarrow \Fb$  defined by \\  $f(0,0,0)=0,\, f(0,0,1)=0,\, f(0,1,0)=1$\\  $f(0,1,1)=1,\, f(0,1,0)=1,\,  f(0,1,1)=1,\,  f(1,0,0)=1,\, f(1,0,1)=1$\\  $f(1,1,0)=0,\, f(1,1,1)=0.$\\ f(1,0,1)=1,\,  f(1,1,0)=0,\, f(1,1,1)=0 \,.$\\  The absolute norm form of $f$ is  $$f (x, y, z) = axyz + bxy + cxz + dzy + ex + f y + gz + h,$$