Return a list of chunks
    :param l: List
    :param n: int The number of items per chunk
    :return: List

def list_chunks(l, n):
    """
    Return a list of chunks
    :param l: List
    :param n: int The number of items per chunk
    :return: List
    """
    if n < 1:
        n = 1
    return [l[i:i + n] for i in range(0, len(l), n)]