{HEAD ~ Each} of {TAIL ~ the discrete sections} is spaced axially from an adjacent one of the discrete sections by a core gap 
of
{ HEAD ~ Each } of { TAIL ~ the discrete sections } is spaced axially from an adjacent one of the discrete sections by a core gap
HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH