Initial size is 0
The list is empty
List size is 4
The list is [1, 2, 4, 6]
The index of 4 is 2
3 not found
Element at 0 is 1
Element at 3 is 6
The list is [1, 4, 6]
The list is [1, 4]
The list is not empty
List size is 2
