anchor.diff:  The chaining of unary operators has unambiguous operator tree.
   ====
   
  -==== Chaining of the same associative operator
  +==== Chaining the same associative operator
   Associative operators that allow chaining are
   
   * https://raw.githack.com/openCypher/openCypher/master/tools/grammar-production-links/grammarLink.html?p=MultiplyDivideModuloExpression[Multiplication]
  
positive.code: In chains of non-associative or mixed operators, for every two operators, the operator appear earlier (more left) in the character string takes precedence, i.e. the operator tree is left-deep.
  ====
  
  ==== Chaining gives extra semantics
  Operators whose chaining gives extra semantics are
  
  * https://raw.githack.com/openCypher/openCypher/master/tools/grammar-production-links/grammarLink.html?p=ComparisonExpression[Comparison operations]
  
negative.code: |====
  
  
  ==== Chaining non-associative or mixed operators
  Non-associative operators that allow chaining with themselves of other operators on the same precedence level are
  
  * https://raw.githack.com/openCypher/openCypher/master/tools/grammar-production-links/grammarLink.html?p=StringListNullOperatorExpression[String, list, and null operations] (where type-compatible)
  