class_docstr: longest common substring similarity
      
class_docstr_tok: ["longest","common","substring","similarity"]
code: def __call__(self, *sequences: str) -> str:
      if not all(sequences):
          return ""
      length = len(sequences)
      if length == 0:
          return ""
      if length == 1:
          return sequences[0]
  
      sequences = self._get_sequences(*sequences)
      if length == 2 and max(map(len, sequences)) < 200:
          return self._standart(*sequences)
      return self._custom(*sequences)
  
imports: from __future__ import annotations
  from difflib import SequenceMatcher
  from typing import Any
  from ..utils import find_ngrams
  from .base import BaseSimilarity
  from .types import TestFunc
label_desc: Use image node_id 3 for calling the LCSStr obj's underlying member method code with example usage: obj.__call__() and returns: self, str, str, sequences, self