def merge_l_t(l, lt):
    """
    Merge a list of tuples lt, each of three values into three lists l.
    For example: [('a', 'b', 'c'), ('a', 'd', 'e')] ->
    [['a', 'a'], ['b', 'd'], ['c', 'e']]
    """
    for t in lt:
        l[0].append(t[1])
        l[1].append(t[2])
        l[2].append(t[0])
    return l