def demo_normal():
RB = RedBlack()
D = RB.E
print D
for i in range(10):
D = RB.insert(i, D)
print D
for i in range(10):
D = RB.delete(i, D)
print D
def demo_normal():
RB = RedBlack()
D = RB.E
print D
for i in range(10):
D = RB.insert(i, D)
print D
for i in range(10):
D = RB.delete(i, D)
print D
