DEBUG_DUP_DEL
DEBUG_DUP_DEL(orig_list + i, orig_list + nextsym);
DEBUG_DUP_DEL((orig_list + i),
DEBUG_DUP_DEL((orig_list + nextsym),
DEBUG_DUP_DEL((orig_list + i),
DEBUG_DUP_DEL((orig_list + nextsym), (orig_list + i));