How to avoid some defined variables showed from the final results

General
1

When I do simulation, the result will show all prior parameter and the variable i defined in generated quantities. If I just want show the result for aie, ade, and aie2 only. how to avoid other defined variables showed from the final result.

generated quantities{
  real ie1[N];
  real ie2[N];
  real de[N];
  real aie1;
  real aie2;
  real ade;
  for (i in 1:N){
  ie1[i]=alpha1*beta1*(exp(alpha1*X[i])/(1+exp(alpha1*X[i]))^2);
  ie2[i]=alpha2*beta2;
  de[i]=c;
  
  }
  aie1=mean(ie1);
  aie2=mean(ie2);
  ade=mean(de);
  
}
3

You may use brackets, for example:

generated quantities {
  real variable_to_be_shown;
  {
    real variable_to_be_excluded = 2.0;
    variable_to_be_shown = 1 + variable_to_be_excluded;
  }
}