Count the number of triangle
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There are 24 triangles in this picture.
1-2-6, 1-2-11, 1-6-11, 2-4-5, 3-4-6, 3-4-8, 3-5-9, 3-5-13, 3-5-15, 3-6-8, 3-9-13, 3-13-15, 5-7-10, 5-9-15, 5-13-15, 7-12-17, 7-16-17, 8-11-13, 9-13-15, 10-12-15, 10-14-15, 12-14-15, 12-16-17, 13-14-16
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