In a certain code language, ‘RETAINED’ is written as ‘ENIATERD’ and ‘MATURITY’ is written as ‘TIRUTAMY’. How will ‘FIREWALL’ be written in that language?

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Let's analyze the coding pattern:

1. RETAINED → ENIATERD
   - Split RETAINED into two parts: RETAI | NED
   - ENIAT | ERD (But this doesn't match directly)
   - Let's check the order:
     - The first part 'ENIAT' is the reverse of 'TAINE' (from RETAINED)
     - The last two letters 'RD' are from the last two letters of RETAINED, but in the code it's 'ERD'.
   - Let's look at MATURITY → TIRUTAMY
     - MATURITY: M A T U R I T Y
     - Code: T I R U T A M Y
     - The first 5 letters: TIRUT (reverse of TURIT)
     - The last 3: AMY (reverse of YAM)
   - Let's try splitting the word into two parts: first n-3 letters, last 3 letters.
     - RETAINED (8 letters): first 5 (RETAI), last 3 (NED)
     - Code: ENIAT (reverse of TAINE), ERD (reverse of DEN)
     - But in code, it's ENIAT ERD
   - Let's try splitting as: first n-4, last 4.
     - RETAINED: RETA | INED
     - Code: ENIA | TERD
     - Doesn't match.
   - Let's check for another pattern: reverse the first part, keep the last part as is.
     - RETAINED: RETAI | NED
     - ENIAT | ERD
     - ENIAT is reverse of TAINE (from RETAINED)
     - ERD is reverse of DEN
   - So, the pattern is: Take the first n-3 letters, reverse them; take the last 3 letters, reverse them; then concatenate.

Let's check with MATURITY:
   - MATURITY (8 letters): first 5 (MATUR), last 3 (ITY)
   - Reverse first 5: RUTAM
   - Reverse last 3: YTI
   - But code is TIRUTAMY
   - Wait, code is TIRUTAMY
   - Let's try reversing the entire word and then shifting the last letter to the end.
   - RETAINED reversed: D E N I A T E R
   - Now, code is ENIATERD
   - ENIATERD is D at the end, ENIATE in the middle, R at the end.
   - Let's try splitting the word into two halves and reversing each:
     - RETAINED: RETAI | NED
     - RETAI reversed: IATER
     - NED reversed: DEN
     - Concatenate: IATERDEN
     - Doesn't match.
   - Let's try another approach: Move the last letter to the end, reverse the rest.
     - RETAINED: D at the end, RETAINE reversed: ENIATER
     - ENIATER + D = ENIATERD
     - This matches!
   - Let's check MATURITY:
     - MATURITY: Y at the end, MATURIT reversed: TIRUTAM
     - TIRUTAM + Y = TIRUTAMY
     - This matches!

So, the rule is: Reverse all letters except the last one, then add the last letter at the end.

Now, apply this to FIREWALL:
- FIREWALL: L at the end, FIREWAL reversed: LAWERIF
- LAWERIF + L = LAWERIFL

Therefore, the answer is LAWERIFL.

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