Question: The 4 - bit abcd number will be incremented / subtracted depending on the selector. When S = 0 , the value of the number

The 4-bit abcd number will be incremented/subtracted depending on the selector. When S=0, the value of the number will increase by 2, while when S=1, the value of the number will decrease by 2. For example, if the number abcd is 9, it will appear as 11 when S=0 and 7 when S=1. Design the required circuit in a hierarchical structure using one-bit full adders.
 The 4-bit abcd number will be incremented/subtracted depending on the selector.

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