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NAND implementation

A sum-of-products expression can be implemented with NAND gates as shown in Fig. 1-13(a). Note that the second NAND gate is drawn with the graphic symbol of Fig. 1-5(b). There are three lines in the diagram with small circles at both ends. Two circles in the same line designate double complementation, and since (x')' = x, the two circles can be removed and the resulting diagram is equivalent to the one shown in Fig. 1-12(a).

Figure 1-5

Figure 1-12

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