OJ Board

what is
All blocks on top of block b are moved to their initial positions prior to the pile taking place.
when i have

0: 0
1: 1 9 2 4
2:
3: 3
4:
5: 5 8 7 6
6:
7:
8:
9:

and pile 8 onto 1
and get ??????

0: 0
1: 1 8 7 6
2: 2
3: 3
4: 4
5: 5
6:
7:
8:
9: 9


second:
what is ...