They are known as vitamins A, the B group,C,D,E and K.

VOA: special.2009.04.21

If I reduce that it would be 3 plus t of b minus 3, so in general 3*k+t this is 3 k plus t of b minus k. OK.

把b减去一个,在外面加个3就可以了,因此也就是。

麻省理工公开课 - 计算机科学及编程导论课程节选

So I'm done when b minus k equals 1, or k equals b minus 1.

因此b-k=1或k-b=1的时候，我就可以停下来了。

麻省理工公开课 - 计算机科学及编程导论课程节选

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