The scale on a straightedge is no longer clear, only the scales 0, 5, 6, and 8 can be seen. Think about it, how many different line segments can be drawn with this ruler only once?
一把直尺上有的刻度已经不清楚了，只能看到0，5，6，8这几个刻度，想一想，用这把尺只画一次可以画出几种不同的线段？
<result>6</result>