prov:value
| - The graphical icons that may be used by the invention are not limited in any way, and may include images of geometric figures, symbols, or characters, such as shown in FIG. 4 a, colors, such as shown in FIG. 4 b, graphical symbols such as smiley faces, light bulbs, check marks, etc., such as shown in FIG. 4 c, and/or regions containing a certain pattern, such as shown in FIG. 4 d.
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