class_docstr: Interface for categories in combinatory grammars.
class_docstr_tok: ["Interface","for","categories","in","combinatory","grammars","."]
docstr: Determines whether two categories can be unified.
   - Returns None if they cannot be unified
   - Returns a list of necessary substitutions if they can.
docstr_tok: ["Determines","whether","two","categories","can","be","unified",".","-","Returns","None","if","they","can","not","be","unified","-","Returns","a","list","of","necessary","substitutions","if","they","can","."]
code: def can_unify(self, other):
      """
      Determines whether two categories can be unified.
       - Returns None if they cannot be unified
       - Returns a list of necessary substitutions if they can.
      """
  
imports: from abc import ABCMeta, abstractmethod
  from functools import total_ordering
  from nltk.internals import raise_unorderable_types
label_desc: Use image node_id 5 for calling the AbstractCCGCategory obj's underlying member method code with example usage: obj.can_unify(other) without return types