import machine
from machine import Pin
from time import sleep

led0 = Pin(2, Pin.OUT)
led1 = Pin(0, Pin.OUT)
led2 = Pin(4, Pin.OUT)

while True:
    # led0 + led1
    led0.on(); led1.on(); led2.off()
    sleep(0.5)
    led0.off(); led1.off()

    # led1 + led2
    led1.on(); led2.on(); led0.off()
    sleep(0.5)
    led1.off(); led2.off()

    # led0 + led2
    led0.on(); led2.on(); led1.off()
    sleep(0.5)
    led0.off(); led2.off()