anchor.diff:  JOIN = (J|j)(O|o)(I|i)(N|n)
   LIMIT = (L|l)(I|i)(M|m)(I|i)(T|t)
   LOCAL = (L|l)(O|o)(C|c)(A|a)(L|l)
  +LOCAL_KEY = (L|l)(O|o)(C|c)(A|a)(L|l)\s(K|k)(E|e)(Y|y)
   MERGE = (M|m)(E|e)(R|r)(G|g)(E|e)
   NOT_NULL = (N|n)(O|o)(T|t)\s(N|n)(U|u)(L|l)(L|l)
   OF = (O|o)(F|f)
  
positive.code: SYSTEM_VERSIONING = (S|s)(Y|y)(S|s)(T|t)(E|e)(M|m)\s(V|v)(E|e)(R|r)(S|s)(I|i)(O|o)(N|n)(I|i)(N|n)(G|g)
  TEMPORARY = (T|t)(E|e)(M|m)(P|p)(O|o)(R|r)(A|a)(R|r)(Y|y)
  TIMESTAMP = (T|t)(I|i)(M|m)(E|e)(S|s)(T|t)(A|a)(M|m)(P|p)
  WHERE = (W|w)(H|h)(E|e)(R|r)(E|e)
  WITH = (W|w)(I|i)(T|t)(H|h)
  
  
negative.code: {JOIN} : {token, {join, TokenChars}}.
  {LIMIT} : {token, {limit, TokenChars}}.
  {LOCAL} : {token, {local, TokenChars}}.
  {LOCAL_KEY} : {token, {local_key, TokenChars}}.
  {MERGE} : {token, {merge, TokenChars}}.
  {NOT_NULL} : {token, {not_null, TokenChars}}.
  {OF} : {token, {of_, TokenChars}}.
  