whereby {HEAD ~ a signal} is transmitted from said second liquid container to {TAIL ~ said first liquid container} 
is transmitted to
whereby { HEAD ~ a signal } is transmitted from said second liquid container to { TAIL ~ said first liquid container }
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL