There is {HEAD ~ apparatus} for creating a beam of a material being input thereto and for selectively including or not including {TAIL ~ respective ones} of a plurality of materials within the beam 
There is { HEAD ~ apparatus } for creating a beam of a material being input thereto and for selectively including or not including { TAIL ~ respective ones } of a plurality of materials within the beam
OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH