Solving a difficult sudoku puzzle from beginning to end Tutorial #50

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Although this puzzle was categorized as difficult, I found it was not as difficult in that the largest number of empty cells in a row, column or block was no more than 4. Even so many tricks and techniques were used.

You will note that wherever possible I only put 2 numbers in an empty cell unitl I have no other way to go. I'm told by Madiolite that this technique is called 'Snyder Notation" I cover this in lesson 4.
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