Before: 1, 2, 3, 4, 5
After removing 5: 1, 2, 3, 4
Before: 1, 2, 3, 4, 5
After removing 3: 1, 2, 4, 5
Before: 1, 2, 1, 2, 3, 2, 1, 4, 1
After pruning all 1's: 2, 2, 3, 2, 4
Execution completed