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Serbian Irregular Sudoku (635)
Instruction:
Place a digit from 1 to 9 in each empty cell so that each digit appears exactly once in every row and column. In bold regions of size N ≤ 9, the digits 1 to N must appear exactly once. In bold regions of size N > 9, the (N-9) largest digits will appear twice while the remaining digits will appear once. For example, a region with 11 cells will contain the digits 1, 2, 3, 4, 5, 6, 7, 8, 8, 9, 9, with the two largest digits, 8 and 9, repeated.