const ret_hu_conv: DefaultRouter = new DefaultRouter(null, ret);
CommonBase.add_ref_from(ret_hu_conv, ret_hu_conv);
CommonBase.add_ref_from(ret_hu_conv, network_graph);
const ret_hu_conv: DefaultRouter = new DefaultRouter(null, ret);
CommonBase.add_ref_from(ret_hu_conv, ret_hu_conv);
CommonBase.add_ref_from(ret_hu_conv, network_graph);