B'Sofia has a string s of length n , consisting only of lowercase English letters. She can perform operations of the following types with this string. Sofia wants to obtain the string t of length m after performing zero or more operations on string s as described above. Please determine whether it is possible or not. The first line contains one integer t ( 1 <= q t <= q 10 ,000 ) -- the number of test cases. The first line of each test case contains two integers n , m ( 1 <= q m <= q n <= q 2 cdot 10^5 ) -- the lengths of string s and t , respectively. The second line of each test case contains the string s of length n , consisting only of lowercase English letters. The third line of each test case contains the string t of length m , consisting only of lowercase English letters. It is guaranteed that the sum of n over all test cases does not exceed 2 cdot 10^5 . For each test case, output "YES" if Sofia can obtain the string t from s using the operations above. Otherwise, output "NO". You can output the answer in any case (upper or lower). For example, the strings "yEs", "yes", "Yes", and "YES" will be recognized as positive responses. In the first test case, Sofia can perform the following operation: In the second test case, Sofia can perform the following operations: In the third test case, it can be shown that it is impossible to obtain t from s using the provided operations. '...