anchor.diff:  {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}}.
  
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: {SYSTEM_VERSIONING} : {token, {system_versioning, TokenChars}}.
  {TEMPORARY} : {token, {temporary, TokenChars}}.
  {TIMESTAMP} : {token, {timestamp, TokenChars}}.
  {VARCHAR} : {token, {varchar, TokenChars}}.
  {WHERE} : {token, {where, TokenChars}}.
  {WITH} : {token, {with, TokenChars}}.
  
  