{TAIL ~ The circuit} includes a first tracking bit line, a second tracking bit line, a tracking cell, and {HEAD ~ a control logic circuit} 
{ TAIL ~ The circuit } includes a first tracking bit line , a second tracking bit line , a tracking cell , and { HEAD ~ a control logic circuit }
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD