wherein {HEAD ~ the voltage differential} between {TAIL ~ the negative stylus voltage} and ground is greater than a threshold voltage for rotating a rotatable element in the electric writable medium, 
between
wherein { HEAD ~ the voltage differential } between { TAIL ~ the negative stylus voltage } and ground is greater than a threshold voltage for rotating a rotatable element in the electric writable medium ,
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH