Initially, {HEAD ~ a distribution graph} is constructed including {TAIL ~ the above mentioned nodes} spanned out by logical links assigned cost values indicating the cost of transferring data between the associated adjacent nodes 
is constructed including
Initially , { HEAD ~ a distribution graph } is constructed including { TAIL ~ the above mentioned nodes } spanned out by logical links assigned cost values indicating the cost of transferring data between the associated adjacent nodes
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH