《战国策·燕一·齐伐宋宋急》
您把宋国和淮北合在一起，就会知道它们冼万乘之国还要强大。齐国一旦兼并它们，就如同增加了一个齐国。
足下以宋加淮北，强万乘之国也，而齐并之，是益一齐也。
Count the Song state and the Huaibei area as a combination, and you will know that this area is even stronger than a nation that has ten thousand chariots. If the Qi state annexed them, it would be like adding another Qi state.