Choose the 5-letter set to complete: Which one set of letters when sequentially placed at the gaps completes the series? s – n x – m n x – m n – s m – x

Introduction / Context:
We insert a 5-letter sequence (with spaces in options for readability) into five gaps to maintain a repeating arrangement among {m, n, s, x}. The visible skeleton cycles through bigrams like “s–n”, “x–m”, and “n–s”.

Given Data / Assumptions:

• Skeleton: s – n x – m n x – m n – s m – x
• Options (ordered fills): “m s s x n”, “n x y m s”, “n m x x n”, “s m n x x”.

Concept / Approach:
Because only {m, n, s, x} appear in the skeleton, any option containing “y” is immediately invalid. We then test remaining candidates to preserve the repeating micro-blocks “…s n…”, “…x m…”, “…n s…”, “…m x…”.

Step-by-Step Solution:
1) Reject “n x y m s” due to “y”.2) Trial “m s s x n” yields joints that realize the sequence of pairs “…s n | x m | n x | m n | s m | x…”.3) Other choices introduce doubled letters at the wrong boundaries (e.g., “…x x…” mid-run) or break the “x→m” and “m→n/s” handoffs.

Verification / Alternative check:
Rescan with sliding bigrams and confirm the target pair set recurs in the correct order.

Why Other Options Are Wrong:

• n m x x n / s m n x x: Force “x x” or “n x x” clusters that contradict the alternation visible in the skeleton.

Common Pitfalls:
Keeping only local adjacency without preserving the whole run of bigrams.

Final Answer:
m s s x n