. Remember that the user may define his own patterns. The data associated with any application custom pattern may be at most 16Kbytes. 

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Hatch patterns are defined in terms of families of lines. The pattern designer specifies a series of families; each family consists of a set of equidistant parallel lines. Thus, by defining one family of lines, one could cover a surface with one set of parallel lines. By asking for two families, the region could be filled with a grid. 
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