Explanation for Jelly Program to make Cityscape (Erik)

a guest Jun 27th, 2017 122 Never
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  1. Œgx'2z⁶ṚY  Main Link
  2. Œg         Group runs of equal elements
  3.   x        Repeat
  4.    '              each individual list
  5.     2                                  twice
  6.      z⁶    Zip (transpose), filling in blanks with spaces
  7.        Ṛ   Reverse the whole thing so it's upside-down
  8.         Y  Join by newlines
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