It's Fun(ctional)

Computer Science Level 3

What will this Python 2 code print?

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x = lambda x: x(x)
y = lambda y: (lambda z: y(y(z)))
z = lambda z: z+1
print (x)(y)(z)(0)
Try to solve this without running the code!
This problem is inspired by what I learned in CS.
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Lucy S by lucy s
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