import time
from machine import Pin
led1=Pin(2,Pin.OUT)
led2=Pin(5,Pin.OUT)
led3=Pin(22,Pin.OUT)
while True:
led1.on()
led2.off()
led3.off()
time.sleep(6)
led1.off()
led2.on()
led3.off()
time.sleep(6)
led1.off()
led2.off()
led3.on()
time.sleep(6)