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ISI2015-PCB-CS-3b

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You are given a logic block $L$ that takes two inputs $A$ and $B$, and produces $A+B$ as output. Realize a two-input $XOR$ gate using only the logic block $L$. You can use as many pieces of block $L$ as you need. You may use the constant function 0; but no other type of gate is allowed.
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L can simply act as XOR GATE.

A B L(A+B) xor
0 0 0 0
1 0 1 1
0 1 1 1
1 1 0 0
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