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