> swapping bits that are both set to 1 would also fail No, swapping two 1 bits works fine. Work it out more slowly, the article covered this and why it always

> swapping bits that are both set to 1 would also fail No, swapping two 1 bits works fine. Work it out more slowly, the article covered this and why it always works. (1,1) => (1^1,1)=(0,1) => (0,1^0)=(0,1) => (0^1,1)=(1,1)