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void SIR(int *Time, double *State, double *Pars, double *dS, double *dI) {

double DecreaseS = -1 * Pars[0] * State[0] * State[1] / Pars[2];
double DecreaseI = -1 * Pars[1] * State[1];

*dS = DecreaseS;
*dI = -1 * DecreaseS + DecreaseI;

}