{HEAD ~ A distribution graph} including {TAIL ~ the nodes} involved in the distribution spanned out by logical links assigned cost values is constructed 
including
{ HEAD ~ A distribution graph } including { TAIL ~ the nodes } involved in the distribution spanned out by logical links assigned cost values is constructed
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH