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:input: <math>|x_1, x_2, x_3,..., x_{n-1}, x_n\rang</math>
:output: <math>|x_1, x_2, x_3,..., x_{n-1}, x_n\oplus x_1 \oplus x_2 \oplus x_3 \oplus...\oplus x_{n-1}\rang</math>.
For example we have state on input: <math>|0, 0, 1,1,0, 1\rang</math>. Last qubit is answer qubits. So on output we will have: <math>|0, 0, 1,1,0, 1\oplus 0\oplus 0\oplus 1\oplus 1\oplus 1\rang=|0, 0, 1,1,0, 1\rang</math>. Last qubit don't change value, and is 1, so function is balanced.
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