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Sandwich Sudoku

I had made a few puzzles combination sandwich sudoku with crypto clues and other rules. So I decided it would be a good idea to make a few more straightforward sandwich sudoku puzzles. This was my first.

Sandwich Sudoku No 1

Each row column and 3x3 box must contain the digits 1-9.

Clues outside the grid indicate the sum of all the digits between the 1&9 in that row or column.