- added break and continue
- added range with one, two or three argument(s)
- added slice (`list[i1:i2]`)
- added negative index (`list[n], with -len(list) ≤ n < len(list)`)
- added lists methods:
  - `list.append(n)`
  - `list.pop()`
  - `list.clear()`
  - `list.sort()`
  - `list.reverse()`
- added `is_permutation(list1, list2)` predicate
- added assignment operators `+=`, `-=`, `*=`, `//=`, `%=`
- functions can now return `bool` and `list`