Sudoku 48: Disjoint Groups Sudoku

Rules: Classic sudoku rules apply. Additionally, no digit can appear in the same position in different 3x3 boxes.

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Solution

Sudoku 47: Outside Sudoku

Next weekend 3rd round of Sudoku Mahabharat starts on Logic Masters India with the theme Outside and Irregular. Here is a practice sudoku! 

Rules: Classic Sudoku rules apply. Additionally, numbers written outside the grid must be inserted in one of the first three cells of the row/column as seen from that direction.
Link:

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Solution