How to make a group diagram in submission

It depends on the requirements of the competition:

1. You can directly insert the picture into Word and save it in Word format (typesetting according to personal preference) and submit it to the contest.

You can compress four pictures into a compressed file and submit it to the contest.

3. You can use PS software to synthesize four pictures into a 2*2 big picture, and then save it as a picture and submit it to the contest.

4. Convert the four pictures into FDF files and submit them.

There are many more (submitted according to the requirements of the competition)