[Cover the BASEs]
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Question:
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ZmxhZ3tEMWRfeTB1X2QwX3RoM19QcjNfQ1RGfQ==

Answer
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1. Base 64 decode
2. flag{D1d_y0u_d0_th3_Pr3_CTF}

Flag:
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flag{D1d_y0u_d0_th3_Pr3_CTF}

Original writeup (https://github.com/str0nkus/NeverlanCTF-2019-Writeups/tree/master/Crypto/Cover%20the%20BASEs).