{HEAD ~ A block layout generator} produces {TAIL ~ interface objects} to be included within an interface of the database, wherein each of the interface objects corresponds to one of the block descriptions and includes a plurality of layout fields 
produces
{ HEAD ~ A block layout generator } produces { TAIL ~ interface objects } to be included within an interface of the database , wherein each of the interface objects corresponds to one of the block descriptions and includes a plurality of layout fields
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL 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 OTH OTH OTH OTH OTH OTH OTH OTH