Inspired by the beautiful "XOV" series from The Bard.
Modified Squishdoku rules apply: Place the digits 0-9 in the grid so that no digit repeats in a row, column, or box. The lines indicate the boundaries of regions, and cells on the lines are simultaneously part of the regions on both sides of the line.
XV: Digits separated by an X sum to 10, those separated by a V sum to 5. ALL Xs AND Vs ARE GIVEN!
Dutch Whisper: Adjacent digits along an orange line must differ by at least 4.
Solution code: Row 4
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