Block
  ExpressionStmt
    Reference
      Identifier : a
  ExpressionStmt
    AssignOperation : PRE_INCREMENT
      Reference
        Identifier : b
  ExpressionStmt
    Reference
      Identifier : a
  ExpressionStmt
    AssignOperation : PRE_DECREMENT
      Reference
        Identifier : b
  ReturnStmt
    Reference
      Identifier : c
  ReturnStmt
  ExpressionStmt
    Reference
      Identifier : c
  Block
    ReturnStmt
  BreakStmt : d
  BreakStmt : 
  ExpressionStmt
    Reference
      Identifier : d
  ContinueStmt : e
  ContinueStmt : 
  ExpressionStmt
    Reference
      Identifier : e
  ReturnStmt
  ExpressionStmt
    Reference
      Identifier : f
  BreakStmt : 
  ExpressionStmt
    Reference
      Identifier : g
