What are the next few numbers in each of these integer sequences? Each of them has a clear and justifiable solution.
1, 2, 3, 5, 8, 9, 12, 20, 21, 22, ??, ??, ...
50, 49, 48, 46, 45, 44, 43, 38, ..., 25, 24, 23, ??, ??, ...
11, 12, 20, 30, 80, 90, 10000, ????
... 4, 5, 6, 8, 10, 40, 46, 60, 61, ??, ??, ...