0: 5
1: 10
2: 7
3: 42
4: 666
5: -1
[5, 10, 7, 42, 666, -1]
removed index 3: [5, 10, 7, 666, -1]
contains value 43: false
index of value 43: -1
added 43 at index 3: [5, 10, 7, 43, 666, -1]
set 44 at index 3: [5, 10, 7, 44, 666, -1]
contains value 44: true
index of value 44: 3
list 2: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
added list 2: [5, 10, 7, 44, 666, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
Is empty (not cleared): false
Is empty (cleared): true
empty list: []
added list 2: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]