anchor.diff:  [NOTE]
   .Associative binary operators
   ====
  -Where the semantics of operator is associative (e.g. addition), a right-deep operator tree produces the same result.
  +Where the semantics of operator is associative (e.g. addition), a right-deep operator tree produces the same result as a left-deep operator tree.
   ====
   
   Consequently, the examples evaluate as follows:
  
positive.code: ----
  where the arithmetic addition is an operand to the arithmetic multiplication and, hence, results in `20` (rather than `11`).
  
  === Intra level precedence
  
  Most precedence level include multiple operators.
  
  
negative.code: 
  == Proposal
  
  The precedence in openCypher is defined by (1) _precedence levels_ and (2) _operator associativity_.
  Both are defined in the following two subsections.
  
  === Precedence levels
  