(Program
  (ExpressionStatements
    (FunctionCall
      (Identifier)
      (NumberLiteral)
    { (StringLiteral)
    ->(StringLiteral) }
      (Function
        (Params
          (Other "required_parameter"
          { (Identifier)
          ->(Identifier) })
          (Other "required_parameter"
            (Identifier)))
        (ExpressionStatements
          (FunctionCall
            (Identifier)
            (Identifier)
          { (Identifier)
          ->(Identifier) }))
        (Return
        { (Identifier)
        ->(Identifier) }))
    { (Boolean)
    ->(Boolean) })))