code: def swap(ls: LazySequenceCopy, i: int, j: int) -> None:
      """Swap the elements ls[i], ls[j]."""
      if i == j:
          return
      ls[i], ls[j] = ls[j], ls[i]
  
imports: import array
  import sys
  import warnings
  from random import Random
  from typing import Callable, Dict, Generic, Iterable, Iterator, List, Optional, Sequence, Tuple, TypeVar, Union, overload
  from hypothesis.errors import HypothesisWarning
label_desc: Use image node_id 6 for calling a global function with example usage: swap(ls, i, j) without return types