code: def from_string(cls, txt):
      if len(txt) == 2 and txt[0] == txt[1] and txt[0] in CARDS:
          return cls(txt[0])
  
imports: from functools import total_ordering
  from itertools import combinations
  from typing import Literal, Union
label_desc: Use image node_id 3 for calling the OnePair obj's underlying member method code with example usage: obj.from_string(cls, txt) and returns: cls