4. Points $A_{1}, \ldots, A_{12}$ are the vertices of a regular 12-gon. How many different 11-segment open broken lines without self-intersections with vertices at these points exist? Broken lines that can be transformed into each other by rotation are considered the same.
Answer: 1024.

Solution: The first vertex of the broken line can be chosen in 12 ways. Each subsequent vertex (except the last one) can be chosen in two ways - it must be adjacent to the already marked vertices to avoid self-intersections. The last vertex is chosen uniquely. We get $12 * 2^{10}$ ways. Considering 12 possible rotations, we get that each broken line will be counted 12 times, so this number must be divided by 12.

Remark: Here, it was implied in the condition that the broken line has a starting and ending point. If, however, we consider broken lines as geometric objects, i.e., without a distinguished "head" and "tail," this significantly complicates the problem.