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CHIP FullAdder {
    IN a, b, c;  // 1-bit inputs
    OUT sum,     // Right bit of a + b + c
        carry;   // Left bit of a + b + c

    PARTS:
	HalfAdder(a=a, b=b, sum=w1, carry=c1);
    HalfAdder(a=w1, b=c, sum=sum, carry=c2);
    Or(a=c1, b=c2, out=carry);
}