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    Yep, seconding this, I don't know if we are expected to put on the riddle solver hat on in order to understand that Matryoshka Dolls is also a key part of making it make sense inside of the logic of comparing lists and finding a criteria in order to iterate them. But I personally just feel as though the instructions are extremely unclear.

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    I believe there's a typo in the formatting of the description?

    0000 Start at 0
    0011 Switch bits 1,2
    0101 Switch bits 2,3
    0110 Switch bits 1,2
    1001 Switch all 4 bits
    1010 Switch bits 1,21100 Switch bits 2,3
    1111 Switch bits 1,2

    Should be:

    0000 Start at 0
    0011 Switch bits 1,2
    0101 Switch bits 2,3
    0110 Switch bits 1,2
    1001 Switch all 4 bits
    1010 Switch bits 1,2
    1100 Switch bits 2,3
    1111 Switch bits 1,2

    Correct?

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    +1 to this, I'm pretty sure that an optimal path for it can be less than 4 steps.

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    This comment is hidden because it contains spoiler information about the solution

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    Javascript version needs a revision, literally the exact same value that is to be expected is being printed out but the assertion is marking it as a fail. Frustrating to say the least. Even looking at the other solutions just brings more questions.