public void AddConstraint(Isotope isotope, int min, int max)
 {
     MinimumFormula.Add(isotope, min);
     MaximumFormula.Add(isotope, max);
 }
 public void AddConstraint(ChemicalFormula minimumChemicalFormula, ChemicalFormula maximumChemicalFormula)
 {
     MinimumFormula.Add(minimumChemicalFormula);
     MaximumFormula.Add(maximumChemicalFormula);
 }