Question: Suppose Bob decided to create a much simpler version of DES that only used P - boxes ( one P - box after another )

Suppose Bob decided to create a much simpler version of DES that only used P-boxes (one P-box after another). Lets call that S-DES(for simplified DES). How much more secure would S-DES be with, say, 4 consecutive P-boxes, than a single P-box?

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