Each hidden layer includes nodes in which {HEAD ~ the output} of the node is fed back to {TAIL ~ that node} as an input with a unit delay occurring in the feedback path  
is fed back to
Each hidden layer includes nodes in which { HEAD ~ the output } of the node is fed back to { TAIL ~ that node } as an input with a unit delay occurring in the feedback path
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH