{HEAD ~ The electrodes} 12 can be constructed from {TAIL ~ any conductive material} such as copper, iron, and aluminum The electrodes 12 should also be constructed with sufficient stiffness for manipulating the tissue surface 
constructed from
{ HEAD ~ The electrodes } 12 can be constructed from { TAIL ~ any conductive material } such as copper , iron , and aluminum The electrodes 12 should also be constructed with sufficient stiffness for manipulating the tissue surface
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL 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 OTH OTH OTH OTH