14. The teacher organized 200 students to practice a group gymnastics routine, and they formed 3 square teams in three directions of the performance venue. So, how many students are standing on the outermost layer of the teams.
【Analysis】 $200=10^{2}+8^{2}+6^{2}, 9 \times 4+7 \times 4+5 \times 4=84$.