{HEAD ~ a plurality} of {TAIL ~ window system processing means}, one of which can refresh a graphic display by producing graphic display data based on original data for the graphic display 
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{ HEAD ~ a plurality } of { TAIL ~ window system processing means } , one of which can refresh a graphic display by producing graphic display data based on original data for the graphic display
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 OTH OTH OTH OTH OTH OTH OTH OTH OTH