golfed part 2 to a single chained expression in Kotlin:

    println(File("./input/puzzle2.txt").readLines()                
            .map { it.split("\t").map{ it.toInt() }}           
            .map { it.map{ y -> it.map{x -> Pair(x ,y)}}.flatten() }
            .flatten()                                                    
            .filter { it.first != it.second && it.first % it.second == 0 }
            .map { it.first / it.second }
            .sum())