In a read miss, a cache might overwrite a line in the shared (S) state without notifying the directory that owns the corresponding memory block. Alternatively, it will notify the directory so that it deletes this cache from the list of sharers.
Show how the following transaction groups (performed one at a time in series) will proceed under both approaches.

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C3: C3: C2: R, M4 R, M2 W, M4