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I am reading the original paper of Argon2 authors and I can understand the algorithm except the indexing part. Can anyone explain two things:

  1. the indexing process and the mapping $J_{1}$, $J_{2}$ to reference block index.
  2. How the $B_{i'j'}$ are fixed in Argon2d, Argon2i and Argon2id.

I tried to simplify things by taking a few lanes and columns but still could not get what is happening in the indexing part.

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