Braille Translator Challenge

I'm using a modular approach to solve both parts. You'll find all Lambdas in the AFE module of the workbook. The one I cannot share at present is Proto2Dλ, which is a generalized 2D lookup (Lookup values can be found in 2D array). I haven't finalized the function but it will be a part of my library in the future.

/*
Part 1

=LET(
    // Re-tile 2D arrays, make phrase concise
    remap, BlockMapλ(Alphabet, 4, 2),
    ph, BYROW(BlockMapλ(Phrase, 3, 2), ARRAYTOTEXT),

    // Letters/characters from Braille alphabet
    letter, TAKE(remap, , 1),

    // Braille dots
    braille, BYROW(DROP(remap, , 2), ARRAYTOTEXT),

    // Lookup phrase, return letters, make consise
    result, CONCAT(XLOOKUP(ph, braille, letter)),
    ph
)



Part 2

=LET(
    // Expansion kernels
    kernel, {0, 0; 1, 1; 2, 2},
    kernel_b, {0, 1; 0, 1; 0, 1},

    // Phrase ~ array
    ex, Explodeλ(phrase2),

    // Mesh grid
    i, MGridλ(Alphabet),
    j, MGridλ(Alphabet, 1),

    // 2D lookup: letter ~ alphabet ~ i/j
    x, 1 + Proto2Dλ(ex, Alphabet, i),
    y, Proto2Dλ(ex, Alphabet, j),

    // Expand indices using kernels
    r, Zoomλ(x, kernel),
    c, Zoomλ(y, kernel_b),

    // Get results
    final, TEXT(INDEX(Alphabet, r, c), ";;;@"),
    final
)

*/