1. after box underflow, select master ball x1.
2. swap with item 2 above []x[] x[]1 item
3. swap with full restore x0
4. swap full restore with []x[] item above it
5. swap full restore with []x[] x[]1 item
6. withdraw 1 from full restore stack
7. withdraw 1 from []x[] item above it
(items should be:
[]x[] x[]1
[]x[] x[]0
[]x[] x[]5
Full restore x[]5)