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As far as I understand,

Linearizable Consistency model is a Data-centric and Strong consistency model.

Data-centric means:
- All clients experience the consistency
- All clients access the same data store
- All clients experience the same ordering
- Non-mobile clients. I.e. replica used doesn’t change. I.e. replicas are not affected by synchronization delays.

Strong means:
- Operations on shared data are synchronized

this link has a good and easy to follow example. But, I a confused about one thing.

In the first image, enter image description here

he is showing only one data-store.

But, in the second image,

enter image description here

he is showing two data stores.

Why is that?

Isn't it possible to show the example with only one data-store in the second case?

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