from machine import Pin 
import time 

led1= Pin(5, Pin. OUT)
led2= Pin(1, Pin. OUT)
led3= Pin(9, Pin. OUT)
while True: 
    led1.on()
    time.sleep(1)   
    led1.off()

    led2.on()
    time.sleep(1) 
    led2.off()
    
    led3.on()    
    time.sleep(1)    
    led3.off()
    
    time.sleep(1)
    led3.off()
    time.sleep(1)    
   
    time.sleep(1)
    led3.off()
    time.sleep(1)    

    time.sleep(1)
    led3.off()
    time.sleep(1)