def validSolution(board):
    x = [x for x in range(1, 10)]
    for number in x:
        for row in board:
            if row.count(number) != 1:
                return False
    for i in range(len(row)):
        column = [row[i] for row in board]
        for number in x:
            if column.count(number) != 1:
                return False
    blocks = [[], [], []]
    for row in board:
        for i in range(len(row)):
            if i <= 2:
                blocks[0].append(row[i])
            elif 2 < i <= 5:
                blocks[1].append(row[i])
            else:
                blocks[2].append(row[i])
        if board.index(row) + 1 == 3:
            for elem in blocks:
                for i in range(len(elem)):
                    if elem.count(elem[i]) > 1:
                        return False
            blocks = [[], [], []]
    return True