{HEAD ~ A reactor} comprising {TAIL ~ an annular iron core} constituting a closed magnetic path and a conductor wound on the iron core 
comprising
{ HEAD ~ A reactor } comprising { TAIL ~ an annular iron core } constituting a closed magnetic path and a conductor wound on the iron core
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH