# sum_numbers2.py
#
# ICS H32 Fall 2025
# Code Example
#
# This function sums the integers in a list of *lists* of integers.

def sum_numbers(numlist: list[list[int]]) -> int:
    '''Adds up the integers in a list of lists of integers'''

    total = 0

    for sublist in numlist:
        for num in sublist:
            total += num

    return total



assert sum_numbers([[1, 2], [3, 4], [5, 6, 7]]) == 28
assert sum_numbers([[1], [2], [3, 4, 5]]) == 15
assert sum_numbers([[3], [], [5]]) == 8
assert sum_numbers([[1, 2]]) == 3
assert sum_numbers([[9]]) == 9
assert sum_numbers([]) == 0