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The text of this question was replaced by "nt nt nt..." by the OP. Should we rollback the edit (at the risk of an indefinite back-and-forth with the OP), or delete the question? Or something else?

Since this is a useful question with two answers, I think we should try to preserve it. (Unfortunately I rejected a rollback edit by @Rob before I realized what was going on with this question).

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    $\begingroup$ You are right. This question already had answers and has been vandalized by the OP himself. $\endgroup$
    – jojeck Mod
    Commented Aug 11, 2017 at 5:58
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    $\begingroup$ @jojek btw, had to roll back another vandalizing edit. $\endgroup$ Commented Oct 20, 2017 at 20:55

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