1. HMD → KOE:

   • H → K: The letter H is the 8th letter in the alphabet, and K is the 11th. The difference is +3.
   • M → O: The letter M is the 13th letter, and O is the 15th. The difference is +2.
   • D → E: The letter D is the 4th letter, and E is the 5th. The difference is +1.

   The pattern for each corresponding letter is +3, +2, +1.

2. BNQ → EPR:

   • B → E: The letter B is the 2nd letter, and E is the 5th. The difference is +3.
   • N → P: The letter N is the 14th letter, and P is the 16th. The difference is +2.
   • Q → R: The letter Q is the 17th letter, and R is the 18th. The difference is +1.

   The pattern here is also +3, +2, +1.

Now, we need to find the letter-cluster that follows the same pattern to match with FLV:

3. ? → FLV:
   • To determine the first letter:
     • F: To find the letter that, when +3 is applied, gives F, we subtract 3 from F (which is the 6th letter). This gives us C (the 3rd letter).
   • To determine the second letter:
     • L: To find the letter that, when +2 is applied, gives L, we subtract 2 from L (which is the 12th letter). This gives us J (the 10th letter).
   • To determine the third letter:
     • V: To find the letter that, when +1 is applied, gives V, we subtract 1 from V (which is the 22nd letter). This gives us U (the 21st letter).

So, the letter-cluster that follows the same pattern and matches with FLV is CJU.

Therefore, the answer is CJU.