There are four small rods whose lengths are 3 cm, 4 cm, 5 cm, and 8 cm. How many different triangles can be formed by choosing three of them.
有四根小棒，它们的长度分别是3厘米、4厘米、5厘米、8厘米．从中选三根，可以拼成多少个不同的三角形．
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