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Hard difficulty hints, answers for Feb. 26 PipsNumber (10): Everything in this space must add up to 10. The answer is 4-2, placed vertically; 6-0, placed horizontally.，推荐阅读im钱包官方下载获取更多信息
If a player gets all four words in a set correct, those words are removed from the board. Guess wrong and it counts as a mistake—players get up to four mistakes until the game ends.，详情可参考safew官方版本下载
A war trumpet was used by Celtic tribes across Europe to intimidate their enemies and to inspire and direct warriors during battle.
// 栈不为空时才判断（避免访问stack.at(-1)时报错）