add back in the final collapsing loop, to 100% ensure memory hardness in the face of possible statistical analysis to avoid the second random mixing step in some cases due to high probability of not being needed in the later portion of the hash computation
add back in the final collapsing loop, to 100% ensure memory hardness in the face of possible statistical analysis to avoid the second random mixing step in some cases due to high probability of not being needed in the later portion of the hash computation

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