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Usowan

Sample

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Solution

Rules

  1. Fill in (colored) cells with the following rules.
  2. Cells containing numbers cannot be colored.
  3. The number shows how many colored cells are next to a cell, vertically and horizontally. However, in each rectangle bordered by bold lines, there is one (and only one) wrong number (showing a wrong colored cell number).
  4. Colored cells cannot connect horizontally or vertically. White cells must not be separated by colored cells.

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