{HEAD ~ The two pads} are separated by {TAIL ~ a liquid barrier material} so that the insulating pad is maintained in a dry operable condition 
are separated by
{ HEAD ~ The two pads } are separated by { TAIL ~ a liquid barrier material } so that the insulating pad is maintained in a dry operable condition
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH