from machine import Pin
from utime import sleep

b1=Pin(7, Pin.OUT)
b2= Pin(20, Pin.OUT)
g1= Pin(9, Pin.OUT)
g2=Pin(10,Pin.OUT)

while True:
    g1.on()
    g2.on()
    b1.off()
    b2.off()
    sleep(1.6)

    b1.on()
    b2.on()
    g1.off()
    g2.off()
    sleep(2)