Wrote implementation in db, has not been user tested yet

    public ArrayList<Molecule> findSubgraph(Molecule molecule) {

        ArrayList<Molecule> returnList = new ArrayList<Molecule>();

        int startingNumber = molecule.getNumAtoms();

        for(int ii : db.keySet()) {

            if (ii >= startingNumber) {

                for(Molecule m: db.get(ii)) {

                    if(m.isSubGraphPresent(molecule) != null) {

                        returnList.add(m);

                        System.out.println(m.moleculeName);

                    }

                }

            }

        }

        return returnList;

    }