{HEAD ~ A cw CO2 laser} disposed for transmitting a second beam in {TAIL ~ a second direction} 
{ HEAD ~ A cw CO2 laser } disposed for transmitting a second beam in { TAIL ~ a second direction }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL