For example, {HEAD ~ the signature key generator} 123 may look for {TAIL ~ a directory} that is named after the signature key 
look for
For example , { HEAD ~ the signature key generator } 123 may look for { TAIL ~ a directory } that is named after the signature key
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH