import time
from machine import Pin

while True:
    for i in range(26, 30):
        for j in range(26, 30):
            if i != j:
                print(i, "/", j)
                Pin(i, Pin.OUT).value(0)
                Pin(j, Pin.OUT).value(1)
                time.sleep(.5)
                Pin(i, Pin.IN)
                Pin(j, Pin.IN)