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NOR implementation

A product-of sums expression can be implemented with NOR gates as shown in Fig. 1-13(b).

Figure 1-13  The second NOR gate is drawn with the graphic symbol of Fig. 1-4(b). Again the two circles on both sides of each line may be removed, and the diagram so obtained is equivalent to the one shown in Fig. 1-12(b).

Figure 1-4

Figure 1-12

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