def unlist(list_of_list):
    """ transform a list of list into one list with all the elements 
    
    Examples
    --------
    >>> unlist([[1,10],[32]])
    [1,10,32]
    >>> unlist([[10],[11],[],[45]])
    [10,11,45]
    """
    res = []
    for l in list_of_list:
        res += l
    return res
