NAND based G20_like adder

Since it's a little bit difficult to buy 74xx based five_input
NOR gates, I felt a need to dissect the equations and to show
a concept which is based on NAND gates instead.

One Bit adder cell:

Symbol:

Four Bit adder:

And the fast lookahead carry.

And be warned, that I didn't build any of this.
If you start experimenting with such a design,
please write an article about this.

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