module sub$-$module$-$verilog $($input $A,B,$ output wire $N,N,3),$

Assign $N=A-{?}^{{?}^{{?}^{?}}}B$;

Assign $N=A$ & $-B$;

Avsign $S=-A$ & $B$;

endinoduie

Consider the following main module$\_$verilog code:

module main$-$module$-$verilog$($input wire $2$:$0$ A$,$ B$,$

output wire $x,Y,2$;

vire $50,51,52,53,54,55,56,57,58,$

sub$-$module$-$verilog eq$\_$bito $(.A(A[0]),.B(B[0]),.M(s0),$

$N(s1),.S(s2),$

sub$-$module$-$verilog eq$\_$bit $(A(A[1]),.B(B(1)),.M(s3),$

an $(s4),-s(s5)?$

sub$-$module$-$verilog eq$\_$bit$2(,A(A[2]),B(B(2)),.M(s6),$

$N(s)h$

assign $x=s0$ is $83$ is s$6!$

asaignY$=97+(56,654)|(56,533651)|$;

endmodule

The module described above represents