Challenge: Solve a 2x2 Underwater

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Thanks, BraeBraeGamer for the challenge! Everyone else, leave yours in the comments below.

Disclaimer: The intro music, In the Hall of the Mountain King (by Grieg), is from YouTube's audio library. I do not own this song, though I am allowed to use it! ... https://www.youtube.com/watch?v=DWArd9_ZeJ0

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