{HEAD ~ Floatation marker buoy} 51 is {TAIL ~ a generally spherically shaped member} made of a buoyant material 
is
{ HEAD ~ Floatation marker buoy } 51 is { TAIL ~ a generally spherically shaped member } made of a buoyant material
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH