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class a:
x = 1
class b:
x = 1
class c:
x = 1
(a1, b1) = (a, b)
a2, b2 = (a, b)
(a3, b3) = (a, b)
a4, b4 = a, b
print a1.x, b1.x
# ^ defined: 2
# ^ defined: 4
print a2.x, b2.x
# ^ defined: 2
# ^ defined: 4
print a3.x, b3.x
# ^ defined: 2
# ^ defined: 4
print a4.x, b4.x
# ^ defined: 2
# ^ defined: 4
t = (a, b), c
(a5, b5), c5 = t
print a5.x, b5.x, c5.x
# ^ defined: 2
# ^ defined: 4
# ^ defined: 6
(a6, (b6, c6)) = (a, (b, c))
print a6.x, b6.x
# ^ defined: 2
# ^ defined: 4