private Bond bondMutually(Atom atom, Atom atomOther, short order, short mad) {
		if (atom.isBonded(atomOther))
			return null;
		Bond bond = new Bond(atom, atomOther, order, mad, (short) 0);
		addBondToAtom(atom, bond);
		addBondToAtom(atomOther, bond);
		return bond;
	}