[Solution] Team of Two CodeChef Solution 

Problem

Your class recently got a maths assignment with $5$ questions. There are $N (\le 20)$ students in the class and at most $2$ people can collaborate. For each student, you know which problems they solved.

Find out if there exists a team of two students who can together solve all problems.

Input Format

The first line of input will contain a single integer $T$, denoting the number of test cases. $T$ test cases follow.

• Each of the following test cases contains $N + 1$ lines, where $N$ is the number of students in the class.
  • The first line contains a single integer $N$.
  • Each of the following $N$ lines contains $K_i + 1$ positive integers separated by whitespaces.
    • In the $i^{th}$ line, the first positive integer $K_i$ is the number of problems the $i^{th}$ student can solve. The next $K_i$ integers are $x_1, x_2, \ldots, x_{K_i}$, the indices of the problems this student can solve.

Output Format

The output must consist of $T$ lines.

• Each line must contain a single string: The solution to the $i^{th}$ test case as a YES or NO (where YES should be returned if some pairing of students is capable of solving all the problems, and NO otherwise).

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You may print each character of the string in uppercase or lowercase (for example, the strings YES, yEs, yes, and yeS will all be treated as identical).

Explanation:

Test case $1:$ There is no student who solved the second question.

Test case $2:$ The second student can solve the first question and the first student can solve all the remaining problems, so they can form a team to solve all the problems together.

Test case $3:$ There is no student who solved fourth and fifth questions.

Test case $4:$ Given $2$ people can collaborate to solve all the problems.