!= would be better

Noted and changed, thank you.

but the move is a valid one

Why do you think this is a valid move? The author's original post doesn't state anything like that, and the author's replies to other solutions suggests that this is not a valid move.

Update: I see the bug you were referring to and have updated my code accordingly. Thanks!

---
It's all fine and dandy until someone has to look at the code.

In reply to Re^3: Difference between two arrays by kwaping
in thread Difference between two arrays by rafl

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