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parameters a,b,c,r;
variable y,x;
function ln(r)=exp(((1-x)^2)*((b/(8.314*y)*exp(c*a/(8.314*y))/((x+(1-x)*exp(c*a/(8.314*y)))^2))+((a/(8.314*y))*exp(c*b/(8.314*y)))/(((1-x)+(1-x)*exp(c*b/(8.314*y)))^2)));
data;
//y,x
278.15         0.001541
283.15            0.002004
288.15            0.002704
293.15         0.003392
298.15            0.004415
303.15            0.005561
308.15         0.007136
313.15            0.009151
318.15            0.01113
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