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	mov	a,#11111110b
loop:	
	mov	p2,a
        rl	a
	mov	r5,#30
	call	delay
	jmp	loop

delay:	mov	r6,#200
del1:	mov 	r7,#200
del:	djnz	r7,del
	djnz	r6,del1
	djnz	r5,delay
	ret

	end