private void boundaryLineBoundaryLine_(int half_edge, int id_a, int id_b,
			int cluster_index_a, int cluster_index_b) {
		if (m_matrix[MatrixPredicate.BoundaryBoundary] == 0)
			return;

		if (m_topo_graph.getHalfEdgeUserIndex(m_topo_graph
				.getHalfEdgePrev(m_topo_graph.getHalfEdgeTwin(half_edge)),
				m_visited_index) != 1) {
			int cluster = m_topo_graph.getHalfEdgeTo(half_edge);
			int clusterParentage = m_topo_graph.getClusterParentage(cluster);

			if ((clusterParentage & id_a) != 0
					&& (clusterParentage & id_b) != 0) {
				int index_a = m_topo_graph.getClusterUserIndex(cluster,
						cluster_index_a);
				int index_b = m_topo_graph.getClusterUserIndex(cluster,
						cluster_index_b);
				assert (index_a != -1);
				assert (index_b != -1);

				if ((index_a % 2 != 0) && (index_b % 2 != 0)) {
					assert ((m_topo_graph.getClusterParentage(cluster) & id_a) != 0 && (m_topo_graph
							.getClusterParentage(cluster) & id_b) != 0);
					m_matrix[MatrixPredicate.BoundaryBoundary] = 0;
				}
			}
		}
	}
private void boundaryLineBoundaryLine_ ( int half_edge , int id_a , int id_b , int cluster_index_a , int cluster_index_b ) { if ( m_matrix [ MatrixPredicate . BoundaryBoundary ] == 0 ) return ; if ( m_topo_graph . getHalfEdgeUserIndex ( m_topo_graph . getHalfEdgePrev ( m_topo_graph . getHalfEdgeTwin ( half_edge ) ) , m_visited_index ) != 1 ) { int cluster = m_topo_graph . getHalfEdgeTo ( half_edge ) ; int clusterParentage = m_topo_graph . getClusterParentage ( cluster ) ; if ( ( clusterParentage & id_a ) != 0 && ( clusterParentage & id_b ) != 0 ) { int index_a = m_topo_graph . getClusterUserIndex ( cluster , cluster_index_a ) ; int index_b = m_topo_graph . getClusterUserIndex ( cluster , cluster_index_b ) ; assert ( index_a != - 1 ) ; assert ( index_b != - 1 ) ; if ( ( index_a % 2 != 0 ) && ( index_b % 2 != 0 ) ) { assert ( ( m_topo_graph . getClusterParentage ( cluster ) & id_a ) != 0 && ( m_topo_graph . getClusterParentage ( cluster ) & id_b ) != 0 ) ; m_matrix [ MatrixPredicate . BoundaryBoundary ] = 0 ; } } } }
with the boundary of Line B.