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enter image description here

This picture was uploaded for the Olympiads of Medicine, from Porto. While the answer might be in portuguese, I don't find it likely.

I tried some Caesar Cyphers, I assumed the colours represented the letters that'll go into the final message, the arrows some sort of permutation of the letters and the backwards B the cypher key.

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  • $\begingroup$ Why the mathematics tag? $\endgroup$
    – user33097
    Commented Jan 4, 2019 at 17:50
  • $\begingroup$ @tilper well, it's probably cryptography based. That's math, no? $\endgroup$
    – J. Dionisio
    Commented Jan 4, 2019 at 21:13
  • $\begingroup$ Right, but AFAIK that tag isn't generally used when the only math-related component is cryptography, so just wondering if there was an additional math piece somehow. $\endgroup$
    – user33097
    Commented Jan 4, 2019 at 21:19
  • $\begingroup$ Is this for an ongoing competition? $\endgroup$
    – Ian MacDonald
    Commented Jan 11, 2019 at 15:25
  • $\begingroup$ @IanMacDonald, it was a friend of mine who shared the problem with me. I don't know if it's part of a competition $\endgroup$
    – J. Dionisio
    Commented Jan 12, 2019 at 14:20

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I think I figured it out using the AtBash cipher, it looks like that is what the arrows mean, as for the backwards B and the paint icon...I have no idea. The answer is (partly) in Portuguese.

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