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a11=0.0169331694;
a12=0.02601772659;
b1=3.440959362e-006;
a21=7.986679703e-010;
a22=0.05532885684;
b2=7.275220112e-005;
dx/dt=(a11-2*b1*x)*(a11*x+a12*y-b1*x*x)+a12*(a21*x+a22*y-b2*y*y)
dy/dt=(a22-2*b2*y)*(a21*x+a22*y-b2*y*y)+a21*(a11*x+a12*y-b1*x*x)

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