from machine import Pin
from time import sleep

x=["a","b","c","d","e","f",]
y=[0,1,2,3,4,5,6]

for i in range(7):
    x[i]=Pin(i,Pin.OUT)

while(1):
    x[0].on()
    x[1].on()
    x[2].on()
    x[3].on()
    x[4].on()
    x[5].on()
    x[6].on()