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  1. or download this
    @A = ($a1,$a2,$a3,$a4);
@B = ($b1,$b2,$b3,$b4);
  2. or download this
    $E = b1*a2*a3*a4 + a1*b2*a3*a4 + a1*a2*b3*a4 + a1*a2*a3*b4 +
b1*b2*a3*a4 + b1*a2*b3*a4 + b1*a2*a3*b4 +
a1*b2*b3*a4 + a1*b2*a3*b4 + a1*a2*b3*b4 +
b1*b2*b3*a4 + b1*b2*a3*b4 + b1*a2*b3*b4 + a1*b2*b3*b4 + b1*b2*b3*b4;