XOR Operation Intuition

1. A ^ 0 == A

2. A ^ A == 0

3. A ^ B == B ^ A

4. (A ^ B) ^ C == A ^ (B ^ C)

(3) and (4) together mean that the order in which numbers are xored doesn’t matter.

Which means that, for example, A^B^X^C^B^A^C is equal to A^A ^ B^B ^ C^C ^ X.

Because of the (2) that is equal to 0^0^0^X.

Because of the (1) that is equal to X.

I don’t think there are any specific keywords that can help you to identify such problems. You just should know above properties of XOR.