&&+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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