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4-bit Ripple Carry Adder

Implement a 4-bit ripple carry adder that adds two 4-bit numbers along with a carry-in bit.

Inputs:
- A: 4-bit operand A
- B: 4-bit operand B
- cin: 1-bit carry input
Outputs:
- sum: 4-bit sum output
- cout: 1-bit carry output

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You can implement this using the + operator, or create individual full adders for each bit.

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