code: def is_valid_line_range(lines: Tuple[int, int]) -> bool:
      """Returns whether the line range is valid."""
      return not lines or lines[0] <= lines[1]
  
imports: import difflib
  from dataclasses import dataclass
  from typing import Collection, Iterator, List, Sequence, Set, Tuple, Union
  from black.nodes import LN, STANDALONE_COMMENT, Leaf, Node, Visitor, first_leaf, furthest_ancestor_with_last_leaf, last_leaf, syms
  from blib2to3.pgen2.token import ASYNC, NEWLINE
label_desc: Use image node_id 2 for calling a global function with example usage: is_valid_line_range(lines) and returns: unknown