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function f=c(p);
z=p(1);
T=377;u1=0.012;u2=u1;
   a1=(4.273e+5)*(T-377.0);
   a11=-6.36e+8;
    a111=2.81e+9;
     a1111=1.74e+10;
     Q11=0.12;Q12=-0.053;Q44=0.052;s11=4.6e-12;s12=-1.1e-12;s44=11.1e-12;

   aa3=a1-(u1+u2)*Q12/(s11+s12);
    aa33=a11+Q12^2/(s11+s12);

  f=aa3*z^2+aa33*z^4+a111*z^6+a1111*z^8£»

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