Difficulty: Medium
Correct Answer: abacb
Explanation:
Introduction / Context:We must choose a 5-letter insertion that yields a single consistent logic with letters a, b, c. Rotations and interleaved repeats are common here.
Given Data / Assumptions:The fixed letters outline alternating ab and bc, with occasional ca closures.
Concept / Approach:Try each option and check all consecutive triples for a stable order such as a→b→c (or a mirrored variant).
Step-by-Step Solution:
Option d = a b a c b restores the needed alternation at every junction.Verification / Alternative check:Every 3-letter window respects one cyclic rule once d is placed.
Why Other Options Are Wrong:They create at least one triple that breaks the cyclic order.
Common Pitfalls:Only validating the first couple of windows.
Final Answer:abacb
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