anchor.diff:      ;
   
   subSelect
  -    : selectClause whereClause solutionModifier	-> ^(SUBSELECT whereClause* solutionModifier)
  +    : selectClause whereClause solutionModifier	-> ^(SUBSELECT whereClause* solutionModifier*)
       ;
       	
   selectClause
  
positive.code: 
  STRENDS : ('S'|'s')('T'|'t')('R'|'r')('E'|'e')('N'|'n')('D'|'d')('S'|'s');
  
  YEAR : ('Y'|'y')('E'|'e')('A'|'a')('R'|'r');
  
  MONTH : ('M'|'m')('O'|'o')('N'|'n')('T'|'t')('H'|'h');
  
negative.code: 
  NOW : ('N'|'n')('O'|'o')('W'|'w');
  
  MD5 : ('M'|'m')('D'|'d')'5';
  
  SHA1 : ('S'|'s')('H'|'h')('A'|'a')'1';
  
  