Apache Spark - Key Value RDD

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What would the following code do?

var inputdata = List((1,2),(1,13),(1,4), (1, 6))
var kvrdd = sc.parallelize(inputdata)
def max(a:Int, b:Int): Int = {
    if(a > b) return a;
    return b
val out = kvrdd.reduceByKey(max)

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