10. In 2013, during the National Day, a city organized a large-scale group gymnastics performance with 2013 participants. All the participants were students from the third, fourth, and fifth grades, and they wore all-red, all-white, or all-blue sports uniforms. It is known that there were 600 students in the fourth grade, 800 students in the fifth grade, and a total of 800 students from the three grades wore white sports uniforms. There were 200 students in the third grade who wore red or blue sports uniforms, 200 students in the fourth grade who wore red sports uniforms, and 200 students in the fifth grade who wore white sports uniforms. Therefore, the number of students in the fourth grade who wore blue sports uniforms is, $\qquad$ people.
【Analysis】As shown in the figure, 213 people
【Analysis】Another solution: As shown in the figure, 13 people
Both answers, 213 or 13, will be given full marks