code: private static boolean validCorrelation(IMolecularFormula formulaMin, IMolecularFormula formulamax) {
          for (IElement element : MolecularFormulaManipulator.elements(formulaMin)) {
              if (!MolecularFormulaManipulator.containsElement(formulamax, element)) return false;
  
          }
          return true;
      }
docs: In the minimal IMolecularFormula must contain all those IElement found in the
  minimal IMolecularFormula.
  
  @param formulaMax  A IMolecularFormula which contains the maximal representation of the Elements
  @param formulaMin  A IMolecularFormula which contains the minimal representation of the Elements
  @return            True, if the correlation is valid