! Data set from "The Guardian", 29 July, 2005. http://www.guardian.co.uk/sudoku

VALUE: [
 ('A' 1) 8  ('F' 1) 3
 ('B' 2) 5  ('G' 2) 4
 ('A' 3) 2  ('E' 3) 7  ('H' 3) 6
 ('D' 4) 1  ('I' 4) 5
 ('C' 5) 3  ('G' 5) 9
 ('A' 6) 6  ('F' 6) 4
 ('B' 7) 7  ('E' 7) 2  ('I' 7) 3
 ('C' 8) 4  ('H' 8) 1 
 ('D' 9) 9  ('I' 9) 8 ]