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Theme: Question Marks
Author/Opus: This is the 75th puzzle from our contributing puzzlemaster Murat Can Tonta.
Rules: Standard Cross the Streams rules.
Answer String: Enter the length in cells of each of the black segments from top to bottom for the marked columns, going in order from A to B to C to D and separating each entry with a comma.
Time Standards (highlight to view): Grandmaster = 5:30, Master = 9:00, Expert = 18:00.