{HEAD ~ What measure} to use for the cost between {TAIL ~ two neighboring devices}, depends on the network at hand 
{ HEAD ~ What measure } to use for the cost between { TAIL ~ two neighboring devices } , depends on the network at hand
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH