For problem statement at 1000-1999/1600-1699/1620-1629/1620/problemB.txt this is a correct solution, but verifier at 1000-1999/1600-1699/1620-1629/1620/verifierB.go ends with All tests passed can you fix the verifier?  ```go
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 ; t > 0; t-- {
		var w, h int
		fmt.Fscan(in, &w, &h)

		var k int

		fmt.Fscan(in, &k)
		bottom := make([]int, k)
		for i := 0; i < k; i++ {
			fmt.Fscan(in, &bottom[i])
		}
		spanBottom := bottom[k-1] - bottom[0]

		fmt.Fscan(in, &k)
		top := make([]int, k)
		for i := 0; i < k; i++ {
			fmt.Fscan(in, &top[i])
		}
		spanTop := top[k-1] - top[0]

		fmt.Fscan(in, &k)
		left := make([]int, k)
		for i := 0; i < k; i++ {
			fmt.Fscan(in, &left[i])
		}
		spanLeft := left[k-1] - left[0]

		fmt.Fscan(in, &k)
		right := make([]int, k)
		for i := 0; i < k; i++ {
			fmt.Fscan(in, &right[i])
		}
		spanRight := right[k-1] - right[0]

		ans := spanBottom * h
		if v := spanTop * h; v > ans {
			ans = v
		}
		if v := spanLeft * w; v > ans {
			ans = v
		}
		if v := spanRight * w; v > ans {
			ans = v
		}

		fmt.Fprintln(out, ans)
	}
}
```