print [x*x for x in range(10)]
print [x*x for x in range(10) if x % 3 == 0]
print [(x, y) for x in range(3) for y in range(3)]
li = [1, 9, 8, 4]
print [elem*2 for elem in li]
print li
li = [elem*2 for elem in li]
print li