model small
.stack 100h
.data
a dw 1
b dw 2
c dw 3
d dw 4

.code

start:
 MOV AX, @data
 MOV DS, AX

 ;<readABCD>

 mov ax, c
 mov bx, d
 or ax, bx ; c | d

 mov bx, a
 mov cx, b
 add bx,cx ; a + b

 cmp bx, ax
 jne else1 ; if  a + b != c | d

 mov bx, d
 mov cx, c
 xor bx,cx ; c ^ d

 mov ax, a
 mov cx, b
 add ax,cx ; a + b

 and ax,bx ; (a + b) & (c ^ d)
 ;<print>
 jmp all

 else1:
 mov ax, a
 mov bx, d
 or ax,bx ; a | d

 mov cx, b
 mov bx, c
 xor cx,bx ; b ^ c

 cmp ax,cx ; if b ^ c != a | d
 jne else2 ;

 and ax,cx ; (b ^ c) & (a | d)
 ;<print>
 jmp all

 else2:
 mov ax, a
 mov bx, b
 xor ax,bx ; a ^ b

 mov cx, c
 mov bx, d
 xor cx,bx ; c ^ d

 or ax,cx ; print a ^ b | c ^ d
 ;<print>
all:
 MOV AH, 4Ch
 INT 21h
end start