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Step 1 This is the start of the puzzle.
Solve this puzzle for yourself at the same time.
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Step 2 Column 4 has a 4 clue, and no matter where these 4 are, these squares must be Black.
 
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Step 3 These squares can all be determined from the clues for each of the rows involved.
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Step 4 These two squares must be Black to complete the clues in the respective columns.
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Step 5 These squares must be crosses to complete the respective rows and columns.
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Step 6 These squares must be Black to complete the clues in Column 1 and Column 2.
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Step 7 These squares must be crosses to complete the respective rows and columns. The puzzle then completes once Column 4 is set correctly.
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Step 8 The completed puzzle.
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