Im looking for a word that means:
making sure it does not happen again in the future
We do not want to distract from this but are focused now on rectifying and _____ [making sure the mistake is not repeated by doing XandY]
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... on rectifying, and on precluding any repetition.
I find it difficult to place an intransitive verb here so suggest transitive preclude.
Preclude = to forestall, to head off