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For challenges related to the processing and placement of whitespace characters (mainly, but not limited to spaces, tabs and line feeds), like challenges related to indentation. For challenges about the esoteric programming language Whitespace, use [whitespace-language] instead.
18
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Numbering Hierarchical Outlines
Write a program that takes in a string where every line consists of the character 0 indented by some number of spaces. The top line is not indented and every other line will be indented by at most one …