anchor.diff:  * `TRUE XOR FALSE XOR TRUE`
   
   [IMPORTANT]
  -.Chaining of binary operators
  +.Chains of binary operators
   ====
   In chains of binary operators, the operator have left-to-right associativity, i.e. for every two operators, the operator appear earlier (more left) in the query string takes precedence and the operator tree is left-deep.
   ====
  
positive.code: ** `foo CONTAINS ('bar' IN list)` is invalid because the containment predicate does not accept a boolean as second operand
  
  [IMPORTANT]
  .Chaining of type-incompatible operators
  ====
  Chains of (partly) type-incompatible operators either
  
  
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
  