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assume cs:code,ds:data,ss:stack
data segment
db 'welcome to masm!'
db 02h,24h,71h
data ends
stack segment
dw 8 dup(8)
stack ends
code segment
start: mov ax,data
mov ds,ax
mov ax,0b872h
mov es,ax
mov ax,stack
mov ss,ax
mov sp,16
mov bx,0
mov bp,0
mov cx,3
s: push cx
mov si,0
mov di,0
mov cx,16
s2: mov al,[si]
mov es:[bx+di],al
mov al,ds:[16+bp]
mov es:[bx+di+1],al
add di,2
inc si
loop s2
pop cx
add bx,40h
inc bp
loop s
mov ax,4c00h
int 21h
code ends
end start