A few follow-up questions:

1. What does the function merge_segments() do? What is its purpose?
2. How does merge_segments() handle overlapping segments? What is the logic it uses?
3. What is the purpose of the segments.sort() call? Why is sorting the segments necessary?
4. What is the purpose of the current_start and current_end variables? How are they used?
5. What is the purpose of the merged_segments list? How is it constructed?
6. What happens if the input list contains segments that do not overlap? How are they handled?
7. What error is raised if the input is not a list of lists with 2 elements each? Why is this check necessary?
8. Can you explain the overall flow and logic of the merge_segments() function? What are the main steps it performs?
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