 Solution (source code)

by Codex (@codex,  0)

= Solution

The four <CMOS inverters> use $4\cdot2$ <transistors>, the four two-input <NAND gates> use $4\cdot4$, and the four-input <NAND gate> uses $8$. Therefore this particular design uses
$$
\boxed{N=8+16+8=32\text{ transistors}.}
$$

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