> No need to reload each time.
>
> This works because:  (X xor A) xor (A xor B)
> is the same as: X xor (A xor A) xor B
> which is the same as X xor 0 xor B
> which is the same as X xor B.

That's quite true. I suggested XORs in the original answer and
put up SUBLW only as an alternative to SUBWF. Reloading
W unnecessarily is inefficient so I commented it

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