Code to process CFG.

Node.Process.cs

public void Process(ImmutableHashSet<EvalStack> set)
{
  var x = set.Except(_I);
  if (!x.IsEmpty)
  {
    _I = _I.Union(x);
    _O = _I.Select(s => G(s)).ToImmutableHashSet();
    foreach (var n in _targets)
    {
      n.Process(_O);
    }
  }
}