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# Author Problem Lang Verdict Time Memory Sent Judged  
196498578 Practice:
bkifhr7 		1800E2 - 31 PyPy 3-64 Accepted 436 ms 21368 KB 2023-03-08 14:45:44 2023-03-08 14:45:45
→ Source 
t=int(input())
for i in range (t):
    n,k=map(int,input().split())
    s1=input();s2=input()
    if n<=k:
        print('YES' if s1==s2 else 'NO')
    else:
        i=n-k
        print("YES" if sorted(s1)==sorted(s2) and s1[i:-i] ==s2[i:-i] else "NO")
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