| http://www.w3.org/ns/prov#value | - A computer graphics display system comprising raster memory means including an array of N rows and M columns of storage sites, means for generating a control signal, means responsive to said control signal and operative to read out in raster fashion data stored in any selected block of n rows and m columns of said storage sites, where n is an integer less than N, and M is an integer less than M, a
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