{HEAD ~ control} means for introducing dynamic operational signals to the chip , so as to cause instantaneous operational voltages at selected test points as {TAIL ~ a function} of operation 
{ HEAD ~ control } means for introducing dynamic operational signals to the chip , so as to cause instantaneous operational voltages at selected test points as { TAIL ~ a function } of operation
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH