Given the class below, how can you use an infix function to check if a number is within a range?

Given the class below, how can you use an infix function to check if a number is within a range?

class Range(val start: Int, val end: Int) {
    infix fun contains(number: Int) = number in start..end
}

fun main() {
    val range = Range(1, 10)
    // Fill in the blank to check if 5 is in range
    val result = range ____ 5
    println(result)
}