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# Author Problem Lang Verdict Time Memory Sent Judged  
256782983 Practice:
Traverser_Steal69 		1800E2 - 31 Python 3 Accepted 155 ms 4776 KB 2024-04-15 16:26:59 2024-04-15 16:27:04
→ Source 
for _ in range(int(input())):
  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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