import time
time.sleep(0.1) # Wait for USB to become ready
from machine import Pin 
ledr=Pin(2,Pin.OUT) 
ledg=Pin(3,Pin.OUT) 
ledb=Pin(4,Pin.OUT) 

ledr.on()
time.sleep(1)
ledr.off() 
ledg.on()
time.sleep(1)
ledg.off() 
ledb.on()
time.sleep(1)
ledb.off() 

ledr.on()
ledg.on()
time.sleep(1)
ledr.off() 
ledg.off() 

ledr.on()
ledb.on()
time.sleep(1)
ledr.off() 
ledb.off() 

ledg.on()
ledr.on()
time.sleep(1)
ledg.off() 
ledr.off() 

ledg.on()
ledb.on()
time.sleep(1)
ledg.off() 
ledb.off() 

ledb.on()
ledr.on()
time.sleep(1)
ledb.off() 
ledr.off() 

ledb.on()
ledg.on()
time.sleep(1)
ledb.off() 
ledg.off()