{HEAD ~ A safety device} loosely extends from the first channel to {TAIL ~ the second channel} when the first and second channel are disposed in the first operative position 
loosely extends to
{ HEAD ~ A safety device } loosely extends from the first channel to { TAIL ~ the second channel } when the first and second channel are disposed in the first operative position
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH