{HEAD ~ The coils} are in {TAIL ~ the form} of spirals and extend in a predetermined direction 
are in
{ HEAD ~ The coils } are in { TAIL ~ the form } of spirals and extend in a predetermined direction
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH