&& b_j \oplus b_i^{-1} \\
&& = (a_0 \oplus \cdots \oplus a_j) \oplus (a_0 \oplus \cdots \oplus a_i)^{-1} \\
&& = (a_0 \oplus \cdots \oplus a_j) \oplus (a_i^{-1} \oplus \cdots \oplus a_0^{-1}) \\
&& = (a_0 \oplus a_0^{-1}) \oplus \cdots \oplus (a_i \oplus a_i^{-1}) \oplus (a_{i+1} \oplus \cdots \oplus a_j) \\
&& = a_{i+1} \oplus \cdots \oplus a_j
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