Data Over laping in assembly language using 8086

assume cs:code,ds:data
data segment
org 2000h
array db 01h,02h,03h,04h,05h,06h,07h,08h,09h,0ah
data ends
code segment
start:mov ax,data
mov ds,ax
mov si,2009h
mov di,200eh
mov cx,10d
go:mov al,[si]
mov [di],al
dec si
dec di
dec cx
jnz go
mov ah,4ch
int 21h
code ends
end start