human
list comprehension over two indexes.
assistant
Here is a Python program to return list comprehension over two indexes

import itertools

def list_comprehension(list_of_lists, index_1, index_2):
    """Returns a list comprehension over two indexes.

    Example:
    list_comprehension([[1,2],[3,4]], 0, 1)
    """
    return [list_of_lists[i][j] for i in range(len(list_of_lists)) for j in range(len(list_of_lists[i]))]

# Enter the list of lists
list_of_lists = [[1,2],[3,4]]

# Calling the function
print((list_comprehension(list_of_lists, 0, 1)))

#Example Output
# [1, 2, 3, 4]

#Remember to inspect code for bugs.