Place the digits 1-9 in each row, column and region. Regions are orthogonally connected and have to be determined. These regions cannot cover any 2x2 section of the grid. A clue outside the grid shows the sum of the digits sandwiched between the 1 and the 9 for that row or column. All of a sandwich's cells (including both crusts) are in the same region. A digit in a circle shows the amount of cells touching it, orthogonally and diagonally, not including itself, which are part of the same region. All circles are given.
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