testPuzzle :: Puzzle
testPuzzle = [
    0, 0, 0, 0, 8, 0, 0, 0, 0,
    0, 0, 0, 1, 0, 6, 5, 0, 7,
    4, 0, 2, 7, 0, 0, 0, 0, 0,
    0, 8, 0, 3, 0, 0, 1, 0, 0,
    0, 0, 3, 0, 0, 0, 8, 0, 0,
    0, 0, 5, 0, 0, 9, 0, 7, 0,
    0, 5, 0, 0, 0, 8, 0, 0, 6,
    3, 0, 1, 2, 0, 4, 0, 0, 0,
    0, 0, 6, 0, 1, 0, 0, 0, 0 ]
testPuzzle :: Puzzle
testPuzzle = [
    0, 0, 0, 0, 8, 0, 0, 0, 0,
    0, 0, 0, 1, 0, 6, 5, 0, 7,
    4, 0, 2, 7, 0, 0, 0, 0, 0,
    0, 8, 0, 3, 0, 0, 1, 0, 0,
    0, 0, 3, 0, 0, 0, 8, 0, 0,
    0, 0, 5, 0, 0, 9, 0, 7, 0,
    0, 5, 0, 0, 0, 8, 0, 0, 6,
    3, 0, 1, 2, 0, 4, 0, 0, 0,
    0, 0, 6, 0, 1, 0, 0, 0, 0 ]
testPuzzle = [
    0, 0, 0, 0, 8, 0, 0, 0, 0,
    0, 0, 0, 1, 0, 6, 5, 0, 7,
    4, 0, 2, 7, 0, 0, 0, 0, 0,
    0, 8, 0, 3, 0, 0, 1, 0, 0,
    0, 0, 3, 0, 0, 0, 8, 0, 0,
    0, 0, 5, 0, 0, 9, 0, 7, 0,
    0, 5, 0, 0, 0, 8, 0, 0, 6,
    3, 0, 1, 2, 0, 4, 0, 0, 0,
    0, 0, 6, 0, 1, 0, 0, 0, 0 ]