hello world

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full content here...

and here's a code block:

sealed interface Instruction { // (1)!
    data class Add(val value: Int) : Instruction
    object NoOp : Instruction
}

private fun String.parseInstruction() = when {
    this == "noop" -> Instruction.NoOp
    startsWith("addx") -> Instruction.Add(substringAfter("addx ").toInt())
    else -> error("Unhandled instruction")
}

1. using the sealed modifier allows us to exhaustively handle instructions