In a code QUEUE is written as Q22 and CHURCH as 1UR1 then BANANA is written as…

Concept: In this letter-coding pattern, a two-letter combination that repeats identically at more than one place in a word is replaced by a single digit, using the same digit for both occurrences; any letter that is not part of such a repeated pair is left unchanged, in its original position, as a letter.

Applying the rule to each word:

1. QUEUE breaks into Q, U-E, U-E: the block UE repeats at the two middle positions, so both occurrences take the same digit; the leading Q has no partner and stays a letter, giving the code Q22.

2. CHURCH breaks into C-H, U, R, C-H: the block CH repeats at the start and at the end, with U and R sitting untouched in between, giving the code 1UR1.

3. BANANA breaks into B, A-N, A-N, A: the block AN repeats in exactly the same middle pattern that UE followed in QUEUE, with B and the final A left as unpaired letters, so the shape is letter, digit, digit, letter.

Cross-check: splitting BANANA any other way -- for instance isolating the single letter N instead of the two-letter block, or reordering the letters and digits -- does not reproduce the letter, digit, digit, letter shape that both QUEUE and CHURCH establish, so only the B, AN, AN, A split is consistent with the given pattern.

So BANANA is coded as B55A.