There are two kinds of moon cakes in different packages, 6 pieces and 8 pieces, in the supermarket. If you want to buy 38 pieces of this kind of moon cakes, how many different ways can you buy them?
超市现有6块装和8块装两种不同包装的月饼，要购买38块这种月饼，可以有多少种不同的买法．
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