code: def test_common_six_gram(self):
      assert fn.commonSixGram("don4ld") == {"don4ld"}
      assert fn.commonSixGram("donald 1992") == {
          "donald",
          "onald1",
          "nald19",
          "ald199",
          "ld1992",
      }
      assert fn.commonSixGram("g00fy  ") == frozenset()
      assert fn.commonSixGram(" c1p   c10p ") == {"c1pc10", "1pc10p"}
  
imports: import unittest
  from dedupe import predicate_functions
  from dedupe.cpredicates import ngrams
label_desc: Use image node_id 17 for calling the TestPredicateFunctions obj's underlying member method code with example usage: obj.test_common_six_gram() without return types