been set block 1410 transfers to block 1416 to bypass this vertex if the visited flag has not been set in the vertex block 1410 transfers to block 1412 which moves this vertex to a new cluster after moving the vertex to a new cluster or if the vertex is being skipped control goes to block 1416 which points to the next vertex in the cluster before returning to block 1408 after all vertices has been checked block 1408 transfers to block 1418 to determine whether the new cluster contains any vertices if the new cluster does not contain any vertices no breaks were discovered and control returns to fig1 if the new cluster does contain vertices block 1418 transfers to block 1420 which adds this cluster to the list of clusters block 1422 then points to the new cluster and transfers to block 1402 to discover any breaks within this new cluster fig1 and 16 show a flowchart for the process of checking a cluster to determine whether it can be subdivided into further clusters the process involves temporarily deleting each connection within the cluster and then tracing all other connections to determine whether all vertices can still be reached through some connection if one or more vertices cannot be reached after temporarily deleting the connection the vertices that cannot be reached are.