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>>  syms x y1 y2 z1 z2 f i n c;
z1=f*(1+n*10^1.4+n.^2*10^2.2+10^(x-8.44)+10^(2*x-18.23)+10^(3*x-32.33)+10^(4*x-47.42)+c*10^2.9+c.^2*10^4.52+c.^3*10^5.22);
z2=i*(1+n*10^2.8+n.^2*10^5.04+n.^3*10^6.77+n.^4*10^7.96+n.^5*10^8.71+n.^6*10^8.74+10^(x-9.03)+10^(2*x-19.45)+10^(3*x-30.67)+c*10^5.3+c.^2*10^7.64+c.^3*10^8.5);
y1=n*(1+10^(9.24-x)+f*(10^1.4+n*2*10^2.2)+i*(10^2.8+n*2*10^5.04+n.^(2)*3*10^6.77+n.^(3)*4*10^7.96+n.^(4)*5*10^8.71+n.^(5)*6*10^8.74));
y2=c*(1+10^(4.27-x)+10^(5.52-2*x)+i*(10^5.3+c*2*10^7.64+c.^(2)*3*10^8.5)+f(10^2.9+c*2*10^4.52+c.^(2)*3*10^5.22));
a=[10^(-9.4)/c,10(13.3-2*x)];
b=[10^(-6.5)/c,10(12.9-2*x)];
i=min(a);
f=min(b);
x=0:0.5:14;
y1=0.2;
y2=0.2;
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