规则Rules：
标准数独基础上，每行列的前两格记为A和B。白格内的提示表示该行列中A和B的和，灰色格内的提示表示该行列中第A格和第B格数字的和。
Classic rules applied. Additionally, the first two cell in each Row/Column is A and B, the clue in white cells show the sum of A and B, the clue in grey cells show the sum of Ath cell and Bth cell in this Row/Column.
