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Say, for four steps, we have

  1. Core A reads a value (e.g. leftmost dot in blue box) which is brought into the cache.
  2. Core B reads a DIFFERENT value from the SAME memory area (e.g. rightmost dot in blue box). The value is brought into the cache.
  3. Core B writes into the value.
  4. Core A tries to read from the same part of memory.

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