anchor.diff:  {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}}.
   
  
positive.code: {JOIN} : {token, {join, TokenChars}}.
  {LIMIT} : {token, {limit, TokenChars}}.
  {LOCAL} : {token, {local, TokenChars}}.
  {MERGE} : {token, {merge, TokenChars}}.
  {NOT_NULL} : {token, {not_null, TokenChars}}.
  {OF} : {token, {of_, TokenChars}}.
  
negative.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)
  VARCHAR = (V|v)(A|a)(R|r)(C|c)(H|h)(A|a)(R|r)
  WHERE = (W|w)(H|h)(E|e)(R|r)(E|e)
  WITH = (W|w)(I|i)(T|t)(H|h)
  
  