EXAMPLE $10\mathrm{.}11$

We wish to design a two$-$input $(x_1,x_2),$

one$-$output $(z)$ fundamental$-$mode circuit that

will operate as follows. The output changes

from $0$ to $1$ only on the first $x_1$ input change

that follows an $x_2$ input change. A $1$ to $0$

output change occurs only when $x_1$ changes

from $1$ to $0$ while $x_2=1.$

Step $1.$ The primitive flow table of Figure $10\mathrm{.}65$ satisfies the stated

requirements. Note the presence of two states with output $0$ in each