code: def test_common_two_tokens(self):
      assert fn.commonTwoTokens("d on 456 ld") == {
          "d on",
          "on 456",
          "456 ld",
      }
      assert fn.commonTwoTokens("donald 1992") == {"donald 1992"}
      assert fn.commonTwoTokens("g00fy  ") == frozenset()
      assert fn.commonTwoTokens(" c1p   c10p ") == {"c1p c10p"}
  
imports: import unittest
  from dedupe import predicate_functions
  from dedupe.cpredicates import ngrams
label_desc: Use image node_id 11 for calling the TestPredicateFunctions obj's underlying member method code with example usage: obj.test_common_two_tokens() without return types