package main

import (
	"bufio"
	"fmt"
	"os"
)

func main() {
	in := bufio.NewReader(os.Stdin)
	out := bufio.NewWriter(os.Stdout)
	defer out.Flush()

	var t int
	fmt.Fscan(in, &t)

	for i := 0; i < t; i++ {
		var n, k int
		fmt.Fscan(in, &n, &k)
		c := make([]int, n)
		for j := 0; j < n; j++ {
			fmt.Fscan(in, &c[j])
		}

		minDays := n
		for color := 1; color <= 100; color++ {
			days := 0
			for j := 0; j < n; {
				if c[j] != color {
					days++
					j += k
				} else {
					j++
				}
			}
			if days < minDays {
				minDays = days
			}
		}
		fmt.Fprintln(out, minDays)
	}
}