docstr: The sense number of the predicate.
code: def sensenumber(self):
      """The sense number of the predicate."""
      return self.roleset.split(".")[1]
  
imports: import re
  from functools import total_ordering
  from xml.etree import ElementTree
  from nltk.corpus.reader.api import *
  from nltk.corpus.reader.util import *
  from nltk.internals import raise_unorderable_types
  from nltk.tree import Tree
label_desc: Use image node_id 3 for calling the PropbankInstance obj's underlying member method code with example usage: obj.sensenumber() and returns: self