The method includes the stage of producing data characterizing {HEAD ~ the defects} of {TAIL ~ appliances} of the appliance chain 
The method includes the stage of producing data characterizing { HEAD ~ the defects } of { TAIL ~ appliances } of the appliance chain
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH