- 給定不重複正整數 m 種類型 m1 m2 m3 ...，每種類型對應正整數數量為 n1 n2 n3 ...，需要取出正整數 p 個任意類型，請列出所有!!取法!!。
- 上述問題舉例：Apple 有三個、Banana 有兩個、Citron 有四個，要取出三個，則取法有 Apple x 3、Apple x 2 + Banana x 1、Apple x 2 + Citron x 1、Apple x 1 + Banana x 2、Apple x 1 + Banana x 1 + Citron x 1、等等。
- 以上述例子 p 為 3，m1 為 Apple，n1 為 3，m2 為 Banana，n2 為 2，m3 為 Citron，n3 為 4。
- 另外，取法是無順序的，舉例：Apple x 2 + Banana x 1 和 Banana x 1 + Apple x 2 算是同一種取法
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