{HEAD ~ At least one signal transmission element} is supported by {TAIL ~ the at least one signal transmission element engagement member} 
is supported by
{ HEAD ~ At least one signal transmission element } is supported by { TAIL ~ the at least one signal transmission element engagement member }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL