point group ✱ point group ✱ point group ✱ point group ✱ point group ✱ point group ✱ point group ✱ point group ✱ point group ✱ point group ✱ point group ✱ point group ✱ point group ✱ point group ✱ point group ✱ point group ✱ point group ✱point group ✱