如何将一个列表中的所有元组组合成一个列表？还要将列表中的第一行与所有其他行进行比较

def combine_tuples(lst):
    combined_list = [item for sublist in lst for item in sublist]
    return combined_list

# 示例用法
original_list = [(1, 2, 3), (4, 5, 6), (7, 8, 9)]
combined_list = combine_tuples(original_list)
print(combined_list)

def compare_rows(lst):
    result = []
    for i in range(1, len(lst)):
        for j in range(len(lst[i])):
            if lst[0][j] == lst[i][j]:
                result.append((lst[0][j], lst[i][j]))
    return result

# 示例用法
original_list = [(1, 2, 3), (1, 5, 6), (1, 8, 9)]
comparison_result = compare_rows(original_list)
print(comparison_result)