DC Sudoku Strategy - Example #4, Steps 21-24

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Steps 21-24 (basic) Step 21 Step 22 Step 23 Step 24 Main Strategy Page | Previous | Next Page 1 - basic steps, 1 to 9 Page 2 - Step 10, more interesting Page 3 - basic steps, 11 to 17 Page 4 - Steps 18, 19 Page 5 - Step 20 Page 6 - basic steps, 21 to 24 Page 7 - Step 25 Page 8 - Step 26 Page 9 - basic steps, 27 to 30 Page 10 - Step 31 Page 11 - basic steps to finish, 32 to 38