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a.x=0 do addition ,x=1 do OR ,x=2 do XOR


org 00h
mov r0,#40h
mov a,@r0
mov r1,a
inc r0
mov a,@r0
mov b,a
inc r0
mov a,@r0 ; second number is in a
cjne r1,#00,n1
 add a,b
 jnc sk
 mov b,#1
sk:mov b,#0h
sjmp las
n1:cjne r1,#01,n2
 orl a,b
 sjmp las
n2:cjne r1,#02,n3
 xrl a,b
 sjmp las
n3:mov a,#00h
 mov b,#00h
las:mov 43h,a
    mov 44h,b
sjmp $
end

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