print("b = a")
a = [1,2,3]
b = a
a.append(4)
print("a: ",a)
print("b: ",b)

print("b = a[:]")
a = [1,2,3]
b = a[:]
a.append(4)
print("a: ",a)
print("b: ",b)

print("b = a")
a = [[1,2],[2,3],[3,4]]
b = a
a.append([4,5])
print("a: ",a)
print("b: ",b)

print("b = a[:]")
a = [[1,2],[2,3],[3,4]]
b = a[:]
a.append([4,5])
print("a: ",a)
print("b: ",b)

print("b = a.copy()")
a = [1,2,3]
b = a.copy()
a.append(4)
print("a: ",a)
print("b: ",b)

print("b = a.copy()")
a = [[1,2],[2,3],[3,4]]
b = a.copy()
a.append([4,5])
print("a: ",a)
print("b: ",b)