{HEAD ~ A first fixed reflecting surface} of a parabolic group reflecting surface can include {TAIL ~ a focus} on the second focus of the first reflecting surface, and at least two second reflecting surface elements 
include
{ HEAD ~ A first fixed reflecting surface } of a parabolic group reflecting surface can include { TAIL ~ a focus } on the second focus of the first reflecting surface , and at least two second reflecting surface elements
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH