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class CalculatorState {
var v1 by mutableStateOf("0")
var v2 by mutableStateOf("0")
val result get() = sum(v1, v2)
fun sum(v1: String, v2: String) = try {
(v1.toInt() + v2.toInt()).toString()
} catch (e: NumberFormatException) {
"Parsing error :("
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