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dS/dt = - A*B*S
dR/dt = A *B*S+B*R*(1-(S+R)/m)
C=S+R
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t= [0 10 20 24 30 36 45 50 54 60 72 320 350];
y = [4.0 4.1 4.15 4.17 4.18 4.19 4.2 4.85 5.1 5.3 5.89 6.10 7.0];

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