If there are 6 points in the middle of a line segment, how many line segments can these 8 points form?
在一条线段中间另有6个点，则这8个点可以构成多少条线段．
<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">8 * 7</gadget>
<output>56</output>

<gadget id="calculator">56 / 2</gadget>
<output>28</output>

<result>28</result>