These loading and removing steps are repeated until all the nodes in {TAIL ~ the group} are provided with {HEAD ~ the software} 
These loading and removing steps are repeated until all the nodes in { TAIL ~ the group } are provided with { HEAD ~ the software }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD