anchor.diff:  * Contains predicate (and right-hand operand)
   * Regular expression predicate
   
  -|https://raw.githack.com/openCypher/openCypher/master/tools/grammar-production-links/grammarLink.html?p=ListOperatorExpression[List operators] (left-hand operand)
  +|https://raw.githack.com/openCypher/openCypher/master/tools/grammar-production-links/grammarLink.html?p=ListOperatorExpression[List predicates] (left-hand operand)
   |
   
   * List element containment predicate (and right-hand operand)
  -* List element access
  -* List slicing
   
   |https://raw.githack.com/openCypher/openCypher/master/tools/grammar-production-links/grammarLink.html?p=NullOperatorExpression[Null predicates] (left-hand operand)
   |
  
positive.code: * https://raw.githack.com/openCypher/openCypher/master/tools/grammar-production-links/grammarLink.html?p=ExistentialSubquery[Existential subqueries]
  * https://raw.githack.com/openCypher/openCypher/master/tools/grammar-production-links/grammarLink.html?p=ParenthesizedExpression[Parenthesized expression]
  
  |11
  |https://raw.githack.com/openCypher/openCypher/master/tools/grammar-production-links/grammarLink.html?p=PropertyOrLabelsExpression[Graph element operators]
  |
  
  * property lookup
  * label expressions
  
  .3+|10
  |https://raw.githack.com/openCypher/openCypher/master/tools/grammar-production-links/grammarLink.html?p=StringOperatorExpression[String operators] (left-hand operand)
  |
  
  * Prefix predicate (and right-hand operand)
  
negative.code: * Less
  * Less or Equal
  
  .4+|Logical operators
  |4
  |https://raw.githack.com/openCypher/openCypher/master/tools/grammar-production-links/grammarLink.html?p=NotExpression[Boolean negation]
  |
  