actor User
control main
main -> CalculatorProgram : init()
main -> CalculatorProgram : run()
User -> CalculatorProgram : 1.0
CalculatorProgram -> Calculator: setValue(1.0)
User -> CalculatorProgram: + 2.0
CalculatorProgram -> Calculator: add(2.0)
User -> CalculatorProgram: * 3.0
CalculatorProgram -> Calculator: multiply(1.0)
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