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BTS: One, two, three, four.

This article was been published more than 6months ago. The information contained herein may be outdated.

For the last Saturday of August, BTS is being revived. Going forward, I will post the brain teaser on the last Saturday of a month, and the solution on the Saturday following it.

With that taken care of, here is our next brain teaser:


Then 4= … ?

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