class_docstr: Class implementing application of a binary combinator to a chart.
  Takes the directed combinator to apply.
class_docstr_tok: ["Class","implementing","application","of","a","binary","combinator","to","a","chart",".","Takes","the","directed","combinator","to","apply","."]
code: def __str__(self):
      return "%s" % self._combinator
  
imports: import itertools
  from nltk.ccg.combinator import *
  from nltk.ccg.combinator import BackwardApplication, BackwardBx, BackwardComposition, BackwardSx, BackwardT, ForwardApplication, ForwardComposition, ForwardSubstitution, ForwardT
  from nltk.ccg.lexicon import Token, fromstring
  from nltk.ccg.logic import *
  from nltk.parse import ParserI
  from nltk.parse.chart import AbstractChartRule, Chart, EdgeI
  from nltk.sem.logic import *
  from nltk.tree import Tree
label_desc: Use image node_id 3 for calling the BinaryCombinatorRule obj's underlying member method code with example usage: obj.__str__() and returns: unknown