{HEAD ~ An umbrella structure} includes a cover, {TAIL ~ a shaft}, a notch, a runner, main ribs and stretchers 
includes
{ HEAD ~ An umbrella structure } includes a cover , { TAIL ~ a shaft } , a notch , a runner , main ribs and stretchers
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH