このようにね：

```
def merge_segments(segments)：
    if not all(isinstance(seg, list) and len(seg) == 2 for seg in segments)：
        raise ValueError("segments should be a list of lists with 2 elements each").
    merged_segments = [] です。
    segments.sort()
    current_start, current_end = segments[0].
    for start, end in segments[1:]：
        if start <= current_end：
            current_end = max(current_end, end)
        else：
            merged_segments.append([current_start, current_end])
            current_start, current_end = start, end
    merged_segments.append([current_start, current_end])
    return merged_segments
```

この関数は次のように使うことができる：
```
 print (merge_segment([[0, 10], [8, 20], [25, 30]]))
```

要素を2つ持つリストのリストを送信しないとエラーになることに注意してください。
Like this one:

def merge_segments(segments):
    if not all(isinstance(seg, list) and len(seg) == 2 for seg in segments):
        raise ValueError("segments should be a list of lists with 2 elements each")
    merged_segments = []
    segments.sort()
    current_start, current_end = segments[0]
    for start, end in segments[1:]:
        if start <= current_end:
            current_end = max(current_end, end)
        else:
            merged_segments.append([current_start, current_end])
            current_start, current_end = start, end
    merged_segments.append([current_start, current_end])
    return merged_segments

You can use this function as:
 print (merge_segment([[0, 10], [8, 20], [25, 30]]))

note that if you do not send a list of lists with 2 elements will rise an Error.