# [MATL], 9 bytes

    2_y|:q^=a

[Try it online!] Or [verify all test cases](https://tio.run/nexus/matl#S/hvFF9ZY1UYZ5v43yXkv64Rl64hlwGXIZcRlzGXCQA).

[MATL]: https://github.com/lmendo/MATL
[Try it online!]: https://tio.run/nexus/matl#@28UX1ljVRhnm/j/v64FAA "MATL – TIO Nexus"