Your program should read sets of data from the std input. The first line of the input contains the number of the data sets. Each data set is presented in the following format:P NCount1 Student1 1Student1 2… Student1 Count1Count2 Student2 1Student2 2… Student2 Count2…CountP StudentP 1StudentP 2… StudentP CountPThe first line in each data set contains two positive integers separated by one blank: P (1 <= P <= 100) – the number of courses and N (1 <= N <= 300) – the number of students. The next P lines describe in sequence of the courses from course 1 to course P, each line describing a course. The description of course i is a line that starts with an integer Count i (0 <= Count i <= N) representing the number of students visiting course i. Next, after a blank, you抣l find the Count i students, visiting the course, each two consecutive separated by one blank. Students are numbered with the positive integers from 1 to N.There are no blank lines between consecutive sets of data. Input data are correct.
，前有阻碍，奋力把它冲开，运用炙热的激情，
