$$: $$ DCD $$ BCD $.$

$$: $$ ROM $$:

$A(x,y,z)=(1,2,4,6)$

$B(x,y,z)=(0,1,6,7)$

$C(x,y,z)=(2,6)$

$D(x,y,z)=(1,2,3,5,7)$