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Time Limit: 1000 MS    Memory Limit: 65536 K

Description

The dwarven kingdom and the giant countries classmates have PE class together.
The students' height from 1 cm to N cm,everyone's height is different from other's.
There are N students in total, and there are M pairs of relationship, such as (i, j)
said the student's height stand at position i is less than the one stand at position j.
Can you find each position of the height of students?

Input

The first line of input is the number of test case.
The first line of each test case contains two integers, N (1 ¡Ü N ¡Ü 200) and M (0 ¡Ü M ¡Ü 40,000).
The next M line each contain two integers a and b, indicating the student's height stand at
position a must be less than the one stand at position b. (1 ¡Ü a, b ¡Ü N)
There is a blank line before each test case.

Output

For each test case output one line the students' heights from position 1 to position N.
If there are several solutions exist, you should output the one with the smallest height for label 1,
then with the smallest height for label 2, then with the smallest height for label 3 and so on...
If no solution exists, output one line,just a number -1.

output a blank line after each test case

Sample Input
4

4 2
1 2
2 1

4 1
2 1

4 1
3 2

3 1
1 1

Sample Output

-1

2 1 3 4

1 3 2 4

-1

Source

ycg663@scuacm
Sichuan University Programming Contest 2012 Preliminary

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